JPH10238960A - Method for inputting sintering material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the bulk density of a sintering material layer being charged on a palette from an auxiliary shoot arranged to the downward of the lower edge part of a charging shoot. SOLUTION: The sintering material 2 is dispersed to the wide range in the direction of the proceeding of the palette 9 by charging the sintering material 2 on the palette 9 swinging an auxiliary shoot 5 arranged to the downward of the edge part of a charging shoot 4 up and down with the fulcrum of a swinging shaft 10. The collision energy on the charging surface of the charging material 2 is reduced, the bulk density of the sintered material layer 8 is decreased, sinterability is improved by the improved ventilation and the yield and the productivity of the sintered ore are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for charging a sintering raw material in which the permeability is improved by reducing the bulk density of a sintering raw material layer charged in a sintering machine.

[0002]

2. Description of the Related Art As is well known, a method for producing a sintered ore by a DL-type sintering machine is to supply a sintering raw material cut out from a surge hopper onto a pallet which advances endlessly, and a plurality of combustion orifices provided in an ignition furnace. Is used to ignite the surface of the sintering material layer with a burner and to draw air from a wind box arranged below the pallet to sinter the sintering material on the pallet while the pallet moves to the terminal side. . In such a sintering method, the degree of ventilation of the sintering material layer charged on the pallet is important in determining the productivity and quality of the sinter.

Therefore, as a method of charging a sintering raw material, a particle size segregation charging method for intentionally reducing the bulk density of a sintering raw material layer deposited on a pallet has been actively employed. For example, in Japanese Patent Application Laid-Open No. 1-104724, a slit chute in which a plurality of linear members are stretched in the width direction is provided on an extension of a charging chute (sloping chute), and a coarse-grained raw material is placed under a sintering raw material layer. In addition, a fine-grained raw material is charged in the upper portion to increase the particle size segregation in the height direction of the sintering raw material layer, thereby improving air permeability. Similarly, in Japanese Patent Application Laid-Open No. 2-251086, a classifier comprising a plurality of rods arranged in parallel with the flow of the sintering raw material cut out from the drum feeder is provided, and a sintering raw material layer in the height direction is provided. The air permeability is improved by increasing the particle size segregation.

It is well known to combine a charging chute and an auxiliary chute in order to increase the particle size segregation of the sintering raw material charged on the pallet.
Japanese Patent No. 54396 discloses a charging chute comprising a sieve mesh provided with an adjustable tilt angle and a blind plate chute provided below the sieve mesh with an independently adjustable tilt angle. Japanese Patent Publication No. 106595 discloses that the inclination angle of the charging chute is adjustable and the middle and lower chute angles are made larger than the upper chute angle.
Japanese Patent Application No. -17793 discloses an apparatus in which a flapper capable of adjusting an angle of charging a sintering pallet is provided on a lower end surface of a charging chute.

[0005]

In the prior art disclosed in the above publication, the air permeability of the sintering material layer is increased by segregating the size of the sintering material charged on the sintering pallet. It is intended to improve. In the case where the charging chute and the auxiliary chute are combined to segregate the particle size of the sintering raw material layer, the angle of the auxiliary chute arranged below the charging chute can be adjusted. However, in this case, the angle of the auxiliary chute is adjusted to a preset angle in consideration of the charging conditions of the sintering raw material and the like, and during charging of the sintering raw material, the angle of the auxiliary chute is fixed. By doing so, the grain size of the sintering material is segregated.

As described above, various measures have been taken to increase the grain size segregation of the sintering raw material cut out from the drum feeder, but the improvement of the air permeability is not sufficient only by improving the grain size segregation. The reason for this is that the height of the sintering raw material cut out from the drum feeder to reach the charging chute is about 1.
This is because the sintering material has a drop energy of more than m, the bulk density of the sintering material layer charged on the pallet increases, and the permeability of the sintering material layer deteriorates.

According to the present invention, when a sintering material having a particle size segregated by percolation (filtration and permeation) when sliding down on a charging chute is charged on a pallet, ventilation is achieved by reducing the bulk density of the sintering material layer. It is an object of the present invention to provide a method for charging a sintering raw material which can improve the sintering property and achieve the improvement of sinter ore productivity and quality.

[0008]

According to a first aspect of the present invention, a sintering material cut out from a surge hopper via a drum feeder is placed on a pallet via a charging chute and an auxiliary chute. The charging of the sintering raw material is characterized in that an auxiliary chute, which is arranged to be inclined below the tip of the charging chute, is moved up and down with a swing axis at the upper end as a fulcrum. Is the way.

According to a second aspect of the present invention, when a sintering raw material cut out from a surge hopper via a drum feeder is charged onto a pallet via a charging chute and an auxiliary chute, a lower portion of the tip of the charging chute is charged. The auxiliary chutes arranged on one side are divided into a plurality of pieces in the width direction of the pallet, and each of the divided auxiliary chutes is sequentially shifted in phase by a predetermined angle in the circumferential direction with respect to the axis center of the swing shaft, and the width of the auxiliary chute is shifted in the width direction. A method for charging a sintering raw material, wherein the auxiliary chutes are arranged adjacent to each other, and each auxiliary chute is charged while moving up and down while sequentially shifting the phase around a pivot axis at an upper end portion as a fulcrum.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG.
When the sintering raw material 2 cut out through the drum feeder 3 rotating in the direction of the arrow is charged onto the pallet 9, a sintering raw material charging device including the charging chute 4 and the auxiliary chute 5 is used. . The loading chute 4 is arranged at a predetermined inclination angle, while the auxiliary chute 5 is swingably mounted on a swing shaft 10 provided horizontally in the width direction of the sintering pallet 9. A split pinion 6A is disposed at one end of the swing shaft 10, and a rack 6B meshes with the split pinion 6A from below.
Is formed. When the rack 6B is moved back and forth in the direction of the arrow using a driving device (not shown), the split pinion 6A rotates left and right about the pivot shaft 10 at the upper end as a fulcrum. Move up and down while changing.

Next, the operation of the present invention will be described. When the sintering raw material 2 cut out from the surge hopper 1 via the drum feeder 3 rotating in the direction of the arrow is loaded onto the pallet 9 via the loading chute, the rack 6B is moved forward and backward in the direction of the arrow, and rocked. By rotating the split pinion 6A right and left about the shaft 10 as a fulcrum, the auxiliary chute 5 repeats up and down movements in an angular range from horizontal to the extension of the charging chute 4.

Since the auxiliary chute 5 repeatedly moves up and down in this manner, the sintering raw material 2 that slides down while being segregated on the inclined charging chute 4 with the grain size segregates.
Is when in the horizontal position, the movement direction is changed horizontally, feed falling stream 7 to be supplied with a horizontal velocity V _x from the tip of the auxiliary chute 5 falls while drawing a parabola 7A. On the other hand, when the auxiliary chute 5 is at an angular position on the extension of the charging chute 4, that is, when the charging chute 4 and the auxiliary chute 5 are at the same inclination angle, the sintering raw material 2 flowing down from the charging chute 4 is used as it is. , The falling material flow 7 falls while drawing a parabola 7C.

When the sintering raw material 2 draws a falling parabola 7A,
Compared to the case of drawing a falling parabola 7C, the former has a lower falling speed at the loading surface, and the falling area of the sintering raw material in the pallet length direction is wide, and it falls over a wide range on the pallet. become. That is, in the former, the collision energy is remarkably reduced due to a decrease in the weight falling per unit area and a decrease in the falling speed as compared with the latter, and the compaction is suppressed.

When the auxiliary chute 5 is at an intermediate angle between the horizontal position and the angle on the extension of the charging chute 4, the raw material falling flow 7 drops while drawing a parabola 7B, and the flow rate per unit area increases. The falling weight and the collision energy are intermediate values between the former and the latter. At this time, the auxiliary shoot 5
Tilt angle horizontal velocity as θ decreases V _X and the vertical velocity V of
Large horizontal velocity V _X in a stream of velocity V obtained by synthesizing the _Y, and the vertical velocity V _Y decreases, collision energy with falling weight per unit area is reduced to decrease, so that consolidation is suppressed . As a result, according to the present invention, the bulk density of the sintering raw material layer 8 loaded on the pallet 9 is reduced, and the air permeability is improved.

The results of the method of the present invention when the sintering raw material charging apparatus shown in FIG. 1 is applied will be described. As a conventional method, a comparative experiment was conducted using a method in which a flapper capable of adjusting a charging angle to a sintering pallet was provided on the lower end face of a charging chute disclosed in Japanese Utility Model Laid-Open No. 62-17793. .
Using the sintering raw materials having the mixing ratios shown in Table 1, the D
Sinter was produced under the operating conditions of the L-type sintering machine. According to the method of the present invention and the conventional method, the bulk density (t /
m ³ ), the yield and productivity (t / m ² ) of the sintered ore are shown in comparison with FIG.

[0016]

[Table 1]

[0017]

[Table 2]

In this embodiment, as shown in FIG. 1, a sintering raw material 2 cut out from a surge hopper 1 through a drum feeder 3 flows down a charging chute 4 and then swings over an upper swing shaft.
Since the pallet 9 is loaded on the pallet 9 via the auxiliary chute 5 moving up and down around the fulcrum, the pallet 9 is loaded in a wide range in the traveling direction. Thereby, the collision energy at the charging surface of the sintering raw material 2 can be reduced, and as shown by the solid line in FIG. 2, the bulk density (t / m ³ ) of the sintering raw material layer 8 is larger in the method of the present invention than in the conventional method. Could be greatly reduced. As a result, the permeability of the sintering raw material layer 8 is improved, and the yield (%) and the production rate (t / m ² ) of the sinter are increased.

Further, according to the method of the present invention, a wide range of the sintering raw material 2 is widely dispersed on the pallet, thereby lowering the raw material deposition angle and reducing the dripping phenomenon of the raw material. Accordingly, the particle size segregation in the height direction of the sintering raw material layer 8 increases, and the energy consumption can be greatly improved by improving the yield and productivity of the sinter.

Hereinafter, another embodiment of the present invention will be described with reference to the drawings. As shown in FIG.
When the sintering raw material 2 cut out by the drum feeder 3 rotating in the direction of the arrow is charged onto the pallet 9, a sintering raw material charging device including the charging chute 4 and the auxiliary chute 15 is used. The loading chute 4 is arranged at a predetermined inclination angle, while the auxiliary chute 15 is attached to a swing shaft 10 provided horizontally in the width direction of the pallet 9 so as to be vertically movable. The auxiliary chute 15 is composed of a plurality of plates divided in the width direction of the pallet 9 as shown in FIG. Each of the plurality of divided auxiliary chutes 15 is provided on a swing shaft 10 supported by a bearing 11.
The phase is sequentially shifted by a predetermined angle in the circumferential direction with respect to the center of the axis and is arranged adjacent to the width direction.

An auxiliary chute 15 is provided below the swinging shaft 10 and a drive lever 13 is provided above the swinging shaft 10. It is oscillated by a driving device 14 connected to 13. That is, an electric motor with a speed reducer provided in the drive device 14.
A plurality of drive-side pulleys 18 are arranged at intervals on a drive shaft 17 rotated by the drive shaft 16, and a driven-side pulley 19 supported by the bearing 12 is opposed to each drive-side pulley 18.
Are arranged. A V-belt 26 extends endlessly between a pair of the driving pulley 18 and the driven pulley 19, and a rotor 21 is fixed to a rotation shaft 20 of the driven pulley 19. A rotating shaft is provided on the side of each rotor 21.
A crankshaft 22 is provided at a position eccentric to 20.

On the other hand, a drive lever provided on the auxiliary chute 15
13, a bearing 23 is provided on the back surface, and a crankshaft is provided between the crankshaft 22 and the support shaft 24 attached to the bearing 23.
Connected by 25. Instead of the V-belt pulley system, it is also possible to use a chain sprocket system in which a drive chain is wound around a driving sprocket and a driven sprocket.

Next, the operation of another embodiment of the present invention will be described. When the motor 16 is driven to rotate the drive shaft 17, the plurality of drive pulleys 18 disposed on the drive shaft 17 rotate, and the driven pulley 19 rotates via the V-belt 26. The rotation of the driven side pulley 19 causes the rotor 21 to rotate about the rotation shaft 20, thereby rotating the crankshaft 22 provided on the eccentric side portion of the rotor 21 about the rotation shaft 20. A crankshaft 25 whose one end is supported by the crank 22 makes a crank motion. By this crank movement, the drive lever 13 connected to the other end of the crankshaft 25 via the support shaft 24 and the bearing 23 causes the swing shaft 10
Swinging up and down with the fulcrum as a fulcrum,
15 is moved up and down with the upper swing shaft 10 as a fulcrum.

When the functions and effects of each of the auxiliary chutes 15 are examined independently, the auxiliary chutes 5 are repeatedly moved up and down within an angular range from a horizontal position to an extension of the charging chutes 4. The sintering raw material 2 is charged as in the case of the embodiment. Here, each of the plurality of divided auxiliary chutes 15 is sequentially rotated, for example, 90 degrees or 60 degrees in the circumferential direction with respect to the axis center of the upper swing shaft 10 supported by the bearing 11.
The phases are shifted by an angle such as degrees and are arranged adjacent to each other in the width direction.

FIGS. 5, 6 and 7 show the operation of the auxiliary chute 5 disposed below the distal end of the charging chute 4 by vertical movement. 5, 6 and 7, (a) shows the case where the auxiliary chute 5 is viewed from above, and (b) shows the case where it is viewed from the front. As shown in FIGS. 5, 6, and 7,
The adjacent auxiliary chutes 15 are sequentially shifted in phase in the vertical movement, and sequentially change from the state of FIG. 5 to the state of FIG. 7 through the state of FIG. By moving the auxiliary chute 15 divided in this way up and down while shifting the phase, the raw material falling flow 7 becomes 7A, 7B, 7A, 7B, as in the case where the auxiliary chute 5 is divided into one as in the above embodiment. As shown by 7C and 7D, the sintering raw material 2 can be charged in a wide range in the traveling direction of the pallet 9, and uniformity of the pallet 9 in the width direction can be expected.

The results of the method of the present invention when the sintering material charging apparatus shown in FIGS. 3 and 4 are applied will be described.
The bulk density (t / m ³ ) of the sintering raw material when the sintered ore was manufactured under the operating conditions of the DL type sintering machine shown in Table 3 using the sintering raw material having the mixing ratio shown in Table 1 above, Fig. 2 shows the yield and productivity (t / m ² ) of the condensate.

[0027]

[Table 3]

In this embodiment, as shown in FIG. 3, the sintering raw material 2 in the surge hopper 1 is cut out from the drum feeder 3, flows down the charging chute 4, and then moves up and down by sequentially changing the phase angle. Multiple auxiliary chutes adjacent in direction
The sintering raw material 2 can be charged over a wide range in the traveling direction of the pallet 9 because the sintering raw material 2 is charged through the pallet 9. Thereby, the collision energy at the charging surface of the sintering raw material 2 can be reduced,
As shown by the dotted line in FIG. 2, the bulk density (t / m ³ ) of the sintering raw material layer 8 can be reduced much more than in the case of the above embodiment. As a result, since the permeability of the sintering raw material layer 8 is further improved, the yield (%) and the production rate (t / m ² ) of the sinter can be increased.

Further, since the sintering raw material 2 is dispersed and dropped over a wide area on the pallet, the raw material deposition angle is reduced, and the dripping phenomenon of the raw material is reduced, so that mixing during the raw material deposition is reduced. In the same manner as in the above-described embodiment, the segregation of grain size in the height direction of the sintering raw material layer is increased, and the energy consumption can be greatly improved by improving the yield and productivity of the sinter.

[0030]

As described above, according to the present invention,
Since the auxiliary chute, which is arranged to be inclined below the tip of the charging chute, repeats up and down movement with the pivot axis at the upper end as a fulcrum,
The sintering raw material can be dispersed over a wide range in the pallet traveling direction, the bulk density of the sintering raw material layer can be significantly reduced, and the air permeability thereof can be improved. In addition, since the deposition angle of the sintering raw material is reduced and the sagging phenomenon is reduced, mixing at the time of deposition is reduced, and the grain size segregation in the height direction of the sintering raw material layer is increased, so that the yield and production of the sinter ore are increased. This greatly improves the performance and particularly contributes to a reduction in the unit energy consumption of coke and the like.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of the device of the present invention.

FIG. 2 compares the bulk density (t / m ³ ), sinter yield (%), and sinter production rate (t / m ² ) of the sintering raw material layer with the conventional method and the method of the present invention. FIG.

FIG. 3 is an explanatory view showing another embodiment of the device of the present invention.

FIG. 4 is a perspective view showing a driving device according to another embodiment of the device of the present invention.

FIG. 5 is a conceptual diagram illustrating vertical movement of an auxiliary chute.

FIG. 6 is a conceptual diagram illustrating vertical movement of an auxiliary chute.

FIG. 7 is a conceptual diagram illustrating vertical movement of an auxiliary chute.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 surge hopper 2 sintering raw material 3 drum feeder 4 charging chute 5, 15 auxiliary chute 6 rocking device 7 raw material falling flow 8 sintering raw material layer 9 pallet 10 rocking shafts 11, 12, 23 bearing 13 drive lever 14 drive device 16 Motor 17 Drive shaft 18 Drive side pulley 19 Driven side pulley 20 Rotary shaft 21 Rotor 22 Crank shaft 24 Support shaft 25 Crank shaft 26 V belt

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsutoshi Igawa 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba In the Technical Research Institute of Kawasaki Steel (72) Inventor Yukio Konishi 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba (72) Inventor Kenichi Sorimachi 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Inside Kawasaki Steel Engineering Laboratory

Claims (2)

[Claims] When a sintering raw material cut out from a surge hopper via a drum feeder is charged onto a pallet via a charging chute and an auxiliary chute, the sintering material is arranged to be inclined below the tip of the charging chute. A method for charging a sintering raw material, wherein the auxiliary chute is loaded while being moved up and down about a pivot axis at an upper end portion. 2. An auxiliary chute disposed below a leading end of the charging chute when charging a sintering raw material cut out from a surge hopper via a drum feeder onto a pallet via a charging chute and an auxiliary chute. Is divided into a plurality of pieces in the width direction of the pallet, and the auxiliary chutes obtained by dividing the plurality of pieces are arranged adjacent to each other in the width direction while sequentially shifting the phase by a predetermined angle in the circumferential direction with respect to the axis center of the swing shaft, A method for charging a sintering raw material, wherein each auxiliary chute is loaded while moving up and down sequentially with a phase shifted around a pivot axis at an upper end portion.