JPH051335A - Device for supplying raw material in sintering machine - Google Patents

Abstract

PURPOSE:To improve the yield of sintering by preventing sliding-down phenomenon of raw material layer and the development of dislocation due to shock at the time of dropping in the case of supplying the raw material into a pallet, and forming the raw material layer having the suitable grain size segregation in the pallet and increasing distribution of C and CaO from lower layer toward upper layer in gentle. CONSTITUTION:This device is composed of a raw material supplying mechanism 3 for supplying the raw material 7 into the pallet 5 and a chute 14 whose upper end is positioned near the raw material supplying mechanism 3 and lower end above the pallel 5 and inclining in reverse direction to shifting direction of the pallet 5. Further, the chute 14 is formed as screen-state composed of plural pieces of rods 15 set in parallel under condition of mutually arranged at the prescribed interval from the upper end toward the lower end in the width direction of the pallet 5, and at least the lower part is formed to gentle concave shape toward the lower end positioned above the pallet 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material charging device in a sintering machine for continuously producing sintered ore, calcined agglomerated ore and the like.

[0002]

2. Description of the Related Art Sintered ore and calcined agglomerated ore are manufactured as follows. That is, a raw material composed of iron ore powder, powdery coke, powdery flux or the like, or raw pellets obtained by mixing and granulating them is supplied into a continuously moving pallet of an endless moving grade type sintering machine. The pallet supplied with such a raw material is sequentially passed through the ignition zone and the firing zone, and the powdery coke on the surface of the raw material in the pallet is ignited in the ignition zone, and the high-temperature combustion exhaust gas generated by the combustion is burned. The raw material in the pallet is heated by sucking it downward by a wind box provided below the pallet in the band, and then baked. Thus, the raw materials in the pallet are calcined and become sinter or calcined agglomerated ore and discharged from the downstream end of the sinter machine.

FIG. 7 is a schematic vertical sectional view of a conventional raw material charging device in the above-mentioned sintering machine. As shown in the drawings, the raw material charging device includes a hopper 1 into which the various raw materials 7 described above are charged, a roll feeder 2 as a raw material supply mechanism provided in a lower end opening of the hopper 1, and an upper end of the roll feeder 2. The chute 4 is located close to the feeder 2 and has a lower end located above the pallet 5.
The chute 4 is in the form of a flat plate having substantially the same width as the pallet 5, and is inclined at a predetermined angle in the direction opposite to the moving direction of the pallet 5 indicated by the arrow. The raw material 7 in the hopper 1 is continuously discharged by the rotation of the roll feeder 2, and is supplied onto the great bar 6 in the pallet 5 through the flat plate-shaped chute 4 inclined at a predetermined angle.

When the raw material is supplied to the pallet 5, for example, when the raw material is raw pellets, the raw material having a large particle size is distributed in the lower layer of the raw material 7 deposited in the pallet 5, and the small particle is in the upper layer. It is necessary to feed the raw material so that the raw material having a diameter is distributed and the particle size is segregated. Pallet 5
When the layer of the raw material 7 supplied inside is made into the segregated state as described above, C and CaO in the raw material layer gradually increase from the lower layer to the upper layer, and the sintered ore of excellent quality can be produced at a high yield. It can be manufactured.

[0005]

The conventional device described above has the following problems. As described above, the raw material 7 continuously discharged by the rotation of the roll feeder 2 is
It is fed down into a pallet 5 after sliding down on a flat plate-shaped chute 4 inclined at a predetermined angle. Therefore, the impact when the raw material 7 is dropped into the pallet 5 and the angle of repose of the raw material layer become large, and an avalanche phenomenon occurs in the raw material layer and a fault occurs. As a result, the grain size segregation of the raw material 7 in the pallet 5 in the layer direction and the accompanying distribution of C and CaO in the raw material layer become non-uniform, and uneven ventilation occurs in the fault caused by the avalanche phenomenon, causing sintering. Yield decreases.

In order to solve the above-mentioned problems, many studies have been made in the past. For example, Japanese Patent Publication No. 59-30776 discloses a raw material charging device described below. In this apparatus, as shown in FIG. 8, a chute 8 for supplying the raw material into the pallet 5 has its upper end positioned close to the roll feeder 2 as the raw material supply mechanism, and the chute 8 moves in the moving direction. And a flat plate-shaped first chute 9 whose lower end is located above the pallet 5 and which is linearly inclined at a predetermined angle in the opposite direction, and parallel to the first chute 9 and below it. The second chute 10 also has a flat plate shape and is linearly inclined and arranged at intervals. An opening 9a is formed in the middle of the first chute 9, and a pallet is formed in the opening 9a. A plurality of rods 11 are attached in the width direction of 5 at predetermined intervals in the vertical direction (hereinafter referred to as prior art 1).

According to the prior art 1, the raw material 7 continuously discharged by the rotation of the roll feeder 2 slides down on the first chute 9, and the coarse-grain raw material 7a passes through the rod 11 having the opening 9a. Are supplied into the pallet 5. On the other hand, fine grain raw material 7b
Is dropped onto the second chute 10 through the gap between the rods 11 of the opening 9a, slides down on the second chute 10, and is supplied onto the coarse-grain raw material 7a in the pallet 5. Thus, in the pallet 5, the coarse grain raw material 7a as the lower layer and the fine grain raw material as the upper layer are provided.
Two raw material layers consisting of 7b are formed.

The raw material charging device described below is also known. In this apparatus, as shown in FIG. 9, chutes 12 for supplying the raw material 7 into the pallet 5 are parallel to each other in the width direction of the pallet 5 from the upper end to the lower end thereof at a predetermined interval. It is formed in a screen shape composed of a plurality of rods 13 arranged. The upper end of the chute 12 is located near the roll feeder 2 as a raw material supply mechanism, and the lower end thereof is located above the pallet 5,
Such a chute 12 is linearly inclined at a predetermined angle in a direction opposite to the moving direction of the pallet 5.
A guide chute 17 is provided in the vicinity of the roll feeder 2 (hereinafter referred to as prior art 2).

According to the prior art 2, the raw material 7 continuously discharged by the rotation of the roll feeder 2 slides down on a chute 12 which is formed in a screen shape and is composed of a plurality of rods 13. 7a is supplied onto the great bar 6 in the pallet 5 through the chute 12 composed of a plurality of rods 13. On the other hand, the fine-grain raw material 7b drops from the gap between the rods 13 and is supplied onto the coarse-grain raw material 7a in the pallet 5. Thus, in the pallet 5, the coarse grain raw material as the lower layer
A raw material layer is formed in which 7a and the fine-grain raw material 7b as the middle upper layer have a slight grain size segregation toward the lower layer.

Prior arts 1 and 2 have the following problems. According to the prior arts 1 and 2, in the pallet 5, a lower layer mainly made of the coarse grain raw material 7a and an upper layer mainly made of the fine grain raw material 7b are formed. However, since the impact when the raw material falls is still large, an avalanche phenomenon occurs in the raw material layer deposited in the pallet 5 and a fault occurs. As a result, it is possible to sufficiently prevent the segregation of the grain size of the raw material layer in the pallet 5 and the accompanying non-uniform distribution of C and CaO in the raw material layer, and the reduction of the sintering yield due to uneven ventilation. Not in.

In the device of Prior Art 2, if the inclination angle of the screen-shaped chute 12 composed of a plurality of rods 13 is made small, the segregation of the coarse-grain raw material and the fine-grain raw material in the layer height direction is promoted. However, the adhesion of the raw material between the rods progresses, and it becomes difficult to maintain the rod gap. In order to obtain the required grain size segregation, the length of the chute 12 must be increased, and as a result, a large number of rods 13 are required, resulting in a problem of increased equipment cost.

Therefore, an object of the present invention is to solve the above-mentioned problems, prevent the avalanche phenomenon of the raw material layer and the generation of the fault due to the impact at the time of dropping, and further, in the pallet,
A raw material layer having an appropriate grain size segregation and a distribution of C and CaO that gradually increases from the lower layer to the upper layer is formed, whereby the sintering yield can be improved, and An object of the present invention is to provide an economical raw material supply device for a sintering machine that requires less equipment cost.

[0013]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above-mentioned problems. As a result, if the chute formed of a plurality of rods in a screen shape is curved in a gentle concave shape from the upper end located in the vicinity of the raw material supply mechanism toward the lower end located above the pallet, The avalanche phenomenon of the raw material layer and the occurrence of faults due to the impact at the time of dropping are prevented, and moreover, there is an appropriate grain size segregation in the pallet, and the distribution of C and CaO increases gently from the lower layer to the upper layer. It has been found that a raw material layer can be formed.

The present invention was made based on the above findings, and a raw material supply mechanism for supplying a raw material to a pallet, its upper end is located in the vicinity of the raw material supply mechanism, and its lower end is A chute that is located above the pallet and is inclined at a predetermined angle in a direction opposite to the moving direction of the pallet, and the chute is in the width direction of the pallet from its upper end to In a raw material supply device for a sintering machine, which is formed in a screen shape and includes a plurality of rods that are arranged in parallel toward each other at a predetermined distance toward a lower end, at least a lower portion of the chute including the plurality of rods. Is characterized by being curved in a gentle concave shape toward the lower end located above the pallet.

Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic vertical sectional view showing a first embodiment of the device of the present invention. As shown in the drawings, in the apparatus according to the first embodiment, a belt-type feeder 3 as a raw-material supply mechanism that uniformly loads a raw material 7 in the width direction and moves in the arrow direction, and an upper end of the belt-type feeder 3 are provided. The chute 14 is located in the vicinity of the discharge end and has its lower end above the pallet 5 and is inclined at a predetermined angle in the direction opposite to the moving direction of the pallet 5.

The chute 14 is an enlarged schematic front view of FIG.
As shown in FIG. 3 along the line AA of FIG.
Is formed in the shape of a screen including a plurality of rods 15 arranged parallel to each other in the width direction of the belt feeder 3 from the upper end to the lower end at a predetermined interval. The upper part 14a of a certain distance from the upper end to the lower end is formed in a flat shape, and the remaining lower part 14b is curved and formed in a gentle concave shape toward the lower end located above the pallet 5. Top 14 of chute 14
The gap between the plurality of rods 15 forming a is smaller than the gap between the plurality of rods 15 forming the curved lower portion 14b.

Reference numeral 16 is a connecting member for connecting a plurality of rods 15 constituting the chute 14 to each other with a predetermined gap and having the above-mentioned shape, and a predetermined interval is provided in the width direction of the rod 15. Four are attached. Reference numeral 17 denotes a plate-shaped guide chute that is located between the discharge end of the belt type feeder 3 and the upper end of the chute 14.

Part of the coarse-grained raw material 7a of the raw material 7 discharged from the discharge end of the belt type feeder 3 through the guiding chute 16 is formed in a screen shape composed of a plurality of rods 15. Downhill on Shoot 14, and part of it
It is dropped from a wide gap between a plurality of rods 15 forming a curved lower portion 14b, and is supplied onto a great bar 6 in a pallet 5 that continuously moves. On the other hand, the fine-grain raw material 7b drops from the narrow gap between the plurality of rods 15 forming the planar upper portion 14a, and is supplied onto the coarse-grain raw material 7a in the continuously moving pallet 5. Thus, in the pallet 5,
A raw material layer having a segregated grain size is formed, which includes a coarse grain raw material 7a as a lower layer and a fine grain raw material 7b as an upper layer that becomes finer toward the upper portion.

The degree of grain size segregation of the layer of the raw material 7 in the pallet 5 is determined by the gap between the plurality of rods 15 constituting the chute 14, the inclination angle (θ) of the flat upper portion 14a of the chute 14,
And it can be changed by adjusting the degree of curvature of the lower portion 14b.

The lower part 14b of the chute 14 is curved and formed in a gentle concave shape toward the lower end located above the pallet 5, and between the plurality of rods 15 constituting the chute 14 is the above-mentioned. Since the gap is formed, the raw material 7 discharged onto the chute 14 drops from the entire gap between the rods 15, and a part of it drops from the lower end of the chute 14 and is supplied into the pallet 5. It Therefore, the falling impact of the raw material 7 is alleviated and the angle of repose of the raw material layer in the pallet 5 is reduced, so that no avalanche phenomenon or fault occurs in the raw material layer. As a result, in the pallet 5, a raw material layer having proper grain size segregation and in which the distribution of C and CaO gradually increases from the lower layer to the upper layer is formed.

FIG. 4 is a schematic vertical sectional view showing a second embodiment of the present invention. In the device of the second embodiment,
As shown in the drawing, a raw material supply mechanism is provided with a raw material 7, a hopper 1 having a cutout gate 1a at a lower side wall of a side opposite to a pallet moving direction, and a counterclockwise clock provided at a lower end opening of the hopper 1. The only difference from the device of the first embodiment is that it consists of a roll feeder 2 that rotates around.

FIG. 5 is a schematic vertical sectional view showing a third embodiment of the present invention. In the device of the third embodiment,
As shown in the drawing, the raw material supply mechanism cuts out the gate 1a at the lower part of the side wall on the pallet moving direction side in which the raw material 7 is charged.
A hopper 1 having a hopper 1 and a roll feeder 2 which is provided at the lower end opening of the hopper 1 and which rotates clockwise, and a chute 14 formed of a plurality of rods 15 in a screen shape. The only difference from the device of the first embodiment is that from the upper end located below the discharge end of 2 to the lower end located above the pallet 5, the whole is curved in a gentle concave shape.

[0023]

EXAMPLES Next, the present invention will be further described by way of Examples and in comparison with Comparative Examples. The apparatus of the first embodiment shown in FIGS. 1, 2 and 3 was used to supply the raw materials into the pallets. The structure of the chute 14 in the device is
It is as follows.

[0024] Rod diameter: 11.5 mm Rod length: 7,500 mm Number of rods Upper part 14a formed in a plane shape: 12 pieces Lower part 14b formed in a curved shape: 10 pieces Spaced between rods formed in a plane shape Upper part 14a: 16mm Curved lower part 14b: Front part: 20mm Rear part: 30mm Chute tilt angle Upper part 14a formed in a plane shape: 58 ° curved lower part 14b: Front part / radius 6m arc rear part / radius 8m arc Distance between connecting materials: 1200mm

For comparison, the conventional apparatus shown in FIG. 7 was used to supply the raw materials into the pallets. The structure of the chute 4 in the device is as follows. Shooting length: 720mm Shooting tilt angle: 58 degrees (linear array)

FIG. 6 shows the raw material layers in the pallet 5 in the layer direction when the raw materials are supplied into the pallet 5 in an amount of 250 T / H · m using the apparatuses of the above-mentioned Examples and Comparative Examples. It is a graph which shows the average particle diameter of a raw material, and the ratio of C and CaO in a raw material layer. In the drawings, the white circles connected by a solid line indicate the above-described examples of the present invention, and the black circles connected by a dotted line indicate the above-mentioned comparative example.

As is apparent from FIG. 6, in the case of the embodiment of the present invention, the difference in the average particle size of the raw materials in the layer direction is about 1.0 mm, and the difference in the ratio of CaO content in the raw material layer is about 2 wt.%. While the difference in the proportion of C in the raw material layer was about 0.4 wt.%, In the case of the comparative example, the difference in the average particle diameter of the raw material in the layer direction was about 0.3 mm, The difference in the CaO content was about 0.4 wt.%, And the difference in the C content in the raw material layer was about 0.2 wt.%, Which were extremely small. As described above, in the case of the examples of the present invention, in the pallet, a raw material layer having an appropriate particle size segregation and having a distribution of coke and CaO 2 gradually increasing from the lower layer to the upper layer is formed. We were able to.

[0028]

As described above, according to the present invention,
When the raw material is supplied into the pallet, the avalanche phenomenon of the raw material layer and the occurrence of the fault due to the impact at the time of falling are prevented, moreover, the pallet has an appropriate grain size segregation, and the distribution of coke and CaO is in the lower layer. From the above, a raw material layer that is gradually increasing toward the upper layer is formed, which makes it possible to improve the sintering yield, and further, it is economical because it is economical because the equipment cost is low. The effect is demonstrated.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a first embodiment of the device of the present invention.

FIG. 2 is a schematic front view of a chute portion in the device of the present invention.

FIG. 3 is a view taken along the line AA of FIG.

FIG. 4 is a schematic vertical sectional view showing a second embodiment of the device of the present invention.

FIG. 5 is a schematic vertical sectional view showing a third embodiment of the device of the present invention.

FIG. 6 is a ratio of CaO content and C content in the raw material layer in the pallet when the raw material is charged into the pallet using the apparatus of the present invention, the average particle diameter of the raw material in the layer direction, Is a graph showing together with a comparative example.

FIG. 7 is a schematic vertical vertical sectional view showing an example of a conventional device.

FIG. 8 is a schematic vertical longitudinal sectional view showing another example of the conventional device.

FIG. 9 is a schematic vertical vertical sectional view showing still another example of the conventional device.

[Explanation of symbols]

1 hopper 16 connecting members 2 Roll feeder 17 Guiding chute 3 belt feeder 4 Conventional shoot 5 pallets 6 Great Bar 7 raw materials 8 Conventional shoots 9 First shot 10 Second shot 11 rod 12 Conventional chute 13 rod 14 Shoot of the present invention 14a upper part of chute 14b Lower part of chute 15 rod

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Atsushi Yamaguchi             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. (72) Inventor Hidetoshi Noda             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. (72) Inventor Shin Makoto             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd.

Claims (4)

[Claims] 1. A pallet moving direction for feeding a pallet to a pallet, a top end of which is located in the vicinity of the pallet, and a bottom end of which is above the pallet. Are arranged in parallel in the width direction of the pallet with a predetermined interval from the upper end to the lower end of the pallet in the width direction of the pallet. In a raw material supply device for a sintering machine formed in a screen shape composed of a plurality of rods, at least the lower part of the chute composed of the plurality of rods, toward the lower end located above the pallet, A raw material supply device for a sintering machine, which is curved in a gentle concave shape. 2. The apparatus according to claim 1, wherein an upper portion of the chute formed of the plurality of rods is formed in a flat shape, and a lower portion thereof is curved in the concave shape. 3. The device according to claim 1, wherein the chute formed of the plurality of rods is formed so as to curve in the concave shape from the upper end toward the lower end. 4. The gap between the plurality of rods forming the upper portion of the chute is smaller than the gap between the plurality of rods forming the lower portion of the chute.
The described device.