JPS5910971B2 - Blast furnace top charging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a top charging device for a blast furnace, which eliminates grain size segregation in the circumferential direction of raw materials to be charged into the furnace, reduces the height of the blast furnace, and The purpose is to efficiently transport raw materials to

Top charging devices for blast furnaces include the bell-type type illustrated in Figure 1A and Figure 1 Inlet, and the type without a bell that has a recycling chute in the furnace as illustrated in Figure 2. something is known.

Figure 1A is a three-bell type, in which raw material is charged from raw material hopper 1 installed on the ground to skip 2.
The raw materials are conveyed to the top of the furnace via a track 3 and are charged into a storage hopper 4 fixed to the top of the furnace.

The raw material charged into the storage hopper 4 is dropped into the middle bell hopper 5 by opening the small bell 6 after reducing the pressure in the middle bell hopper 5 until it becomes equal to atmospheric pressure.

Next, in order to drop the material in the middle bell hopper 5 to the large bell hopper 1, close the small bell 6 and then drop the material in the middle bell hopper 5.
This is done by pressurizing the inside of the large bell hopper 7 until it becomes equal to the internal pressure and opening the middle bell 8.

Such pressure adjustment in the middle bell hopper 5 is called equalization pressure adjustment.

Since the raw materials are fed into the storage hopper 4 by the skip 2 from the same position, the raw materials form a lopsided pile in the storage hopper 4.

For this purpose, the storage hopper 4 is rotatably installed together with the small bell 6, for example, 60 degrees, 120 degrees, 180 degrees, 240 degrees, etc.
The raw material is fed into the large bell hopper 7 by rotating it 300 degrees and 360 degrees.

After a predetermined amount of raw material is deposited in the large bell hopper 7, the large bell 9 is opened and the raw material is charged into the furnace.

In this type of material, after the raw material is put into the storage hopper 4 for transportation by the skip 2, the empty skip 2 is lowered to the ground, the skip 2 is filled with raw material on the ground, and then the raw material is refilled. Since the material is transported to the top of the furnace, ■ transportation of raw materials cannot be carried out efficiently; ■ a rotating device 31 must be installed in the storage hopper 4, making the structure complicated; to become high.

■ Inability to charge raw materials uniformly in the circumferential direction of the furnace.

■ Segregation of grain size of raw materials in the circumferential direction inside the furnace;
There are other problems.

The two-bell type shown in the opening of Figure 1 transports the raw material from the ground to the top of the furnace using a belt conveyor 10, and does not rotate the storage hopper, but instead has a distribution chute 11 in the small bell hopper 5A. It differs from the three-bell type in that it is provided with a bell 8 and that it does not have a middle bell 8, but otherwise there is no particular difference.

Therefore, except for the problems of the bell type furnace top charging device shown in (1) to (3) above, the bell type furnace top charging device has the same problems.In particular, since the storage hopper 4 does not rotate, the material cannot be transferred into this hopper. When charging the raw material, particle size segregation occurs in the raw material in the circumferential direction around the furnace core.

This particle size segregation does not disappear even after charging into the furnace.

This point is even more problematic than the above-mentioned item (2).

FIG. 2 shows a furnace top charging device that has a recycling chute inside the furnace and does not have a bell.

This type of furnace has two hoppers 4A and 4B having a pressure equalization function at the top of the furnace.

The raw material is transported from the ground to the top of the furnace by a belt conveyor 10, and is transferred to the hopper 4A. through a distribution chute 12. One of 4B is filled.

During this time, the raw material is dropped from the other hopper through the vertical chute 13 into a distribution chute 14 provided in the furnace, and the distribution chute 14 is rotated around the furnace core to perform charging.

Therefore, by adjusting the tilt angle θ of the rotation chute 14, there is an advantage that the raw material can be charged to any position in the circumferential direction of the furnace.

However, in this type, hopper 4A
, 4B are installed eccentrically with respect to the furnace core, particle size segregation of the raw materials occurs when the raw materials are charged into the hoppers 4A and 4B, and furthermore, the raw materials are charged into the furnace from the hoppers 4A and 4B. When entering, a horizontal velocity vector of the raw material grains is generated,
Even if the rolling chute 14 is continuously rolled and charged, if the tilting angle θ of the rolling chute 14 is constant, a difference will occur in the material charging locus within the furnace.

Therefore, the charging position and particle size distribution in the circumferential direction of the furnace become uneven.

Among these non-uniformities, the charging position can be resolved by changing the tilt angle θ, but the segregation of raw material particle size cannot be eliminated.

Therefore, in this type of charging device, the vertical chute 13 is lengthened or a tilting chute 15 is installed within the vertical chute 13 in order to eliminate the horizontal velocity vector at the point of drop into the loading chute 14. I'm making adjustments.

However, such treatment increases the height of the entire furnace top charging device and the falling distance of the raw material becomes long.
In addition to the problem of powdering of the raw material, there are other problems such as that the raw material charging control device including the adjustment device for the tilting chute 15 becomes complicated.

The present invention has been made to solve the above-mentioned problems of conventional devices.

The present invention will be explained below based on the drawings.

FIG. 3 is a cross-sectional view illustrating the present invention.

As shown in FIG. 3, a storage hopper 4 and a fixed hopper 7A having an equalizing and exhausting pressure function are arranged, with the storage hopper 4 being the upper stage.
In addition, each hopper is installed in a stepped manner with its axis aligned with the blast furnace core axis, and a circular or polygonal opening area is provided at the bottom of the storage hopper 4 and/or the bottom of the fixed hopper 7A with the center of the furnace core. It is equipped with a variable opening/closing mechanism that can change the opening and closing mechanism.

It is effective to have the storage hopper 4 removably placed on the upper stage of the fixed hopper 7A and to engage it with the transport vehicle 18. If the storage hopper 4 is configured in this way, it is possible to fill the storage hopper 4 with raw materials on the ground. Therefore, it is possible to easily fill the storage hopper 4 without causing particle size segregation of the raw materials.

Therefore, as will be described later, when the raw materials are filled in the hopper 4 on the ground so as not to cause particle size segregation in the circumferential direction, and then placed on the fixed hopper 7A, the storage hopper 4 is placed on the fixed hopper 7A as shown in FIG. and storage hopper 4 shown at the beginning of Figure 1.
, it has the function of storing raw materials at the top of the furnace.

After loading, the pressure inside the fixed hopper 7A is reduced until it becomes equal to atmospheric pressure, and then the seal valve 19 provided at the top of the fixed hopper 7A is opened, and then the discharge gate 20 at the bottom of the storage hopper 4 is opened to discharge the raw material. Drop into fixed hopper 7A,
Thereafter, the seal valve 19 is closed and the pressure inside the fixed hopper 7A is increased to the same level as the furnace internal pressure, and then the seal valve 19A is opened and the discharge gate 20A provided at the bottom of the fixed hopper 7A is opened to discharge the raw material into the vertical chute 13. Shooting through 1
4 and charge it while rotating it through the processing chute 14.

The raw materials in the storage hopper 4 are dropped into the fixed hopper 7A, and the empty storage hopper 4 is separated from the fixed hopper 7A by closing the discharge gate 20 and lifting it up by the transport cart 18.
Transported above ground for filling with raw materials.

Therefore, after the conveyance, there is no storage hopper 4 at the top of the furnace.

Note that when the present invention is applied to a bell-type furnace top charging device, the bell rod 17 for opening and closing the bell passes through the inside of the storage hopper, so it is impossible to do so as is. Regardless, for example,
This is made possible by directly connecting a crank mechanism and a lever to the bell, as shown in Japanese Patent No. 809, and rotating the lever to open and close the bell.

The discharge gate 20 provided at the bottom of the storage hopper 4 has a variable opening/closing mechanism 21 whose opening area can be changed into a circular or polygonal shape around the furnace core.

FIG. 4 is a diagram illustrating a desirable variable opening/closing mechanism 21.

4A shows a plan view, and the opening in FIG. 4 shows a sectional view taken along line XX in FIG. 4A.

That is, a semicircular groove 23 whose cross-sectional area gradually increases is provided at the center of the contact surface of the pair of rollers 22, 22, and the pair of rollers 22, 22 are rotated in opposite directions. This is a variable opening/closing mechanism that exposes a groove with a circular cross section between 22 and 22.

FIG. 5 is a bottom plan view showing another example.

In this example, a plurality of blades 24 covering an opening 32 provided at the bottom of the storage hopper 4 are rotated all at once, and the opening area is changed into a polygonal shape by adjusting the rotation angle of each blade 240. can be done.

FIG. 6 shows yet another example.

FIG. 6A shows a side view, and FIG. 6A shows a bottom plan view.

This type of storage hopper is equipped with shutters 25, 25 that can be rotated from side to side via a shaft 30 at the bottom of the storage hopper, and a pair of semicircular openings of different diameters that can be rotated inside these shutters 25. A plurality of sets of apertures 26 and 26A having a predetermined cross section are provided, and one set of the semicircular apertures 26 and 26A having a predetermined cross section is rotated to combine them to form an opening with a circular cross section, and then the outer shutter 25 is opened to form this opening. The material is dropped from the container.

The above-mentioned variable opening/closing mechanism 21 allows the discharge gate 20 provided at the bottom of the storage hopper 4 to have a circular or polygonal opening centered on the vertical axis of the storage hopper 4. Fixed raw materials inside hopper-7A
It can be dropped vertically.

Therefore, if the raw material in the storage hopper 4 has no segregation in particle size in the circumferential direction with respect to the vertical axis, the fixed hopper
Even within 7A, grain size segregation in the circumferential direction with respect to the vertical axis does not occur.

In addition, if the variable opening/closing mechanism 21 is further provided in the discharge gate 20A at the bottom of the fixed hopper 7A, particle size segregation in the circumferential direction around the furnace core can be prevented when raw materials are charged into the furnace from the fixed hopper 7A. This is extremely desirable.

Furthermore, the storage hopper 4 is particularly effective in a blast furnace equipped with a bellless top charging device having a recycling chute in the furnace.

That is, since it does not have a bell, the bell rod 17 is
In addition to being able to be installed without any restrictions, the raw material can be charged vertically into the furnace, making it possible to eliminate the horizontal vector that occurs when the raw material falls as in the past.

Next, the transportation of the storage hopper 4 and the filling of raw materials into the storage hopper 4 will be explained.

The storage hopper 4 is suspended and engaged with a carrier vehicle 18, and the carrier vehicle 18 runs on a track 3 laid from the ground to the top of the furnace.

Advantageously, the line 3 is double track.

That is, by setting the railway as a double track and placing one transport vehicle 18 on each track, both transport vehicles are operated alternately so that when one of the transport vehicles is at the top of the furnace, the other transport vehicle is on the ground. Conveying efficiency can be improved.

In the present invention, it is desirable to install a raw material filling device 27 near the end of the line on the ground, which fills the raw material in the circumferential direction centering on the vertical axis of the storage hopper 4 without biasing the particle size.

This raw material filling device 27 is of a type in which the storage hopper 4 is placed on a rotary table 28 and the rotary table 28 is rotated by a drive device 29 to fill the raw material from the raw material hopper 1 into the storage hopper 4; The raw material is filled vertically from the raw material hopper 1 to the vertical axis of the storage hopper 4. Among the dropping type and the vertically dropping type described above, it is effective to use a type in which the flow of the raw material is given a swirling motion to cause it to fall.

When filling the raw material into the storage hopper 4 with the raw material filling device 27, it is possible to eliminate particle size segregation of the raw material in the circumferential direction around the vertical axis of the storage hopper 4. This is important when charging raw materials.

It is particularly advantageous to install the line 3 and raw material charging device 2T according to the present invention in a blast furnace equipped with a bellless top charging device having a recycling chute inside the furnace.

That is, as mentioned above, in this type of blast furnace, the raw material can be charged at a desired location in the circumferential direction of the furnace, but on the other hand, it has the disadvantage that the particle size distribution K of the raw material tends to be uneven in the circumferential direction of the furnace. If there is particle size segregation in the raw material in the circumferential direction in the storage hopper 4 installed at the top of the furnace, the adverse effects of this segregation cannot be resolved.

However, in the present invention, the storage hopper 4 installed at the top of the furnace is transported to the ground by a trolley 18 running on the track 3, and the raw material filling device 27 fills the raw material with uniform particle size around the vertical axis. The storage hopper 4 is efficiently placed in its original position on the furnace top by means of the cart 18 as described above.

Therefore, the step of charging raw materials into the storage hopper 4 at the top of the furnace can be omitted, and particle size segregation of the raw materials in the storage hopper 4 is less likely to occur.

As described above, in the present invention, when charging raw materials into the furnace,
Particle size segregation of raw materials in the circumferential direction around the furnace core can be eliminated.Therefore, there is no need to rotate the storage hopper at the top of the furnace or provide a distribution chute within a fixed hopper. There is no need for charging equipment, and there is no need to lengthen the vertical chute in blast furnaces that have a distribution chute within the furnace, so it is possible to reduce the height of the blast furnace, and there is no need for storage installed at the top of the furnace. The hopper itself is separated from the fixed hopper, filled with raw materials on the ground, and transported to the top of the furnace again by a conveyor truck running on a track, so the process of charging raw materials into the storage hopper at the top of the furnace can be omitted, and the storage hopper can be filled with raw materials. This has the effect that transportation can also be carried out efficiently.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views illustrating conventional furnace top charging equipment; Figure 1A shows a 3-bell type, Figure 1 shows a 2-bell type; The figure is a cross-sectional view of a bellless furnace top charging device having a recycling chute in the furnace, FIG. 3 is a cross-sectional view illustrating the furnace top charging device of the present invention, and FIGS. 4 to 6 are according to the present invention. 4A is a plan view, the opening in FIG. 4 is a sectional view taken along line XX in FIG. 4A, and FIG. 5 is a bottom plan view, Figure 6A is a side view, and Figure 6A is a bottom plan view. 1... Raw material hopper, 2... Skip, 3... LJ path, 4... Storage hopper, 4A, 4B... Hopper , 5...
Medium bell hopper, 5A...Small bell hopper, 6
...Kobell?・・・・・・Big bell hopper,
7A...Fixed hopper, 8...Medium bell, 9...Large bell, 10...Belt conveyor, 11, 14...Service Shoot times, 12...
... Distribution chute, 13 ... Vertical chute, 15 ... Tilting chute, 16 ... Furnace entrance surface, 17 ... Bell rod, 18 ... ．． ．． ．．
．． ．． Transport truck, 19. 1 9A...Seal valve, 20.2OA...Variable opening/closing mechanism, 22.
・．． ...Roller, 23...Groove 124...
... Feather, 25 ... Uyatsuta, 26, 26A
... Squeezing, 27 ... Raw material filling device, 2
8... Rotating table, 29... Drive device, 30... Shaft, 31... Rotating device,
32...Opening.

Claims (1)

[Scope of Claims] 1. A top charging device for a blast furnace in which a fixed hopper having a pressure equalization function is installed with the same axis as the core of the blast furnace,
A top charging device for a blast furnace, characterized in that a variable opening/closing mechanism capable of changing the opening area in a circular or polygonal shape around the furnace core is provided at the bottom of the fixed hopper. 2. A storage hopper that temporarily stores raw materials and a fixed hopper that has a pressure equalization function are installed in a tiered manner so that their center axis is the same as the blast furnace core axis and the storage hopper is on the upper level. A top charging device for a blast furnace, characterized in that a variable opening/closing mechanism is provided at the bottom to change the opening area in a circular or polygonal shape around the furnace core. 3 A storage hopper that temporarily stores raw materials and a fixed hopper that has a pressure equalization and exhaust function are installed in a tiered manner so that their center axis is the same as the core axis of the blast furnace, and storage hopper 1 is on the upper level. and a top charging device for a blast furnace, characterized in that a variable opening/closing mechanism capable of changing the opening area in a circular or polygonal shape around the furnace core is provided at the bottom of the fixed hopper. 4. A storage hopper that temporarily stores raw materials and a fixed hopper that has a pressure equalization function are installed in a tiered manner so that their center axis is the same as the blast furnace core axis, and the storage hopper is on the upper level. A variable opening/closing mechanism that can change the opening area in a circular or polygonal shape centering on the furnace core is provided at the bottom of the furnace core, and the storage hopper is removably placed on the top of the fixed hopper, and is engaged with a conveyance cart, so that the storage hopper can be attached to the top of the furnace. 1. A top charging device for a blast furnace, characterized in that a transport track is provided between the top of the blast furnace and the ground, and a material filling device for filling a storage hopper with material is provided near the track on the ground.