JPH06323745A - Sintering pallet - Google Patents

Abstract

PURPOSE:To prevent consolidation of a material packed layer of a lower part and to improve productivity by high permeation by regularly dispersing a support member having a sinter cake support surface on a sintering grate having a pallet group to be connected and fed, and so hanging it as to embed it in the layer. CONSTITUTION:At least one or more sinter cake support members 12 each having a trapezoidal shape are provided at a suitable interval in a lateral direction of a pallet 4. In this case, the member 12 is embedded in a packed layer 5 of a material charged through a chute 3 at a position to be engaged under a drum feeder 2a provided at a lower part of a surge hopper 2. Then, a surface layer of the layer 5 is ignited by an igniting furnace 6, the air is sucked to its lower part to burn coke in the layer 6, and sintering reaction is advanced. Thus, a flat platelike sinter case is supported without excess or insufficiency to improve permeability of the case and the layer 5 to improve productivity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet for sintering, and more particularly to the structure of a pallet used in a sinter machine for iron ore.

[0002]

2. Description of the Related Art A conventional sintered ore manufacturing process is shown in FIG.

Ore which is the main raw material for the production of sintered ore is cut out from the hopper 10, limestone which is an auxiliary raw material is cut out from the hopper 8, return ore is cut out from the hopper 9, and coke which is fuel is cut out from the hopper 7. Humidified, granulated and used as a sintering raw material.

The sintering raw material 1 is conveyed from the mixer 11 to the surge hopper 2 by the belt conveyor and stored, then cut out by the drum feeder 2a and charged into the pallet of the sintering machine through the chute 3 to obtain the raw material. The filling layer 5 is formed.

In the case of a sintering process using iron ore as a main raw material, the thickness of the raw material filling layer is usually about 600 mm. In the sintering machine, the surface layer of the raw material packed layer is ignited by the ignition furnace 6, the coke in the raw material packed layer is burned while sucking air to the lower side of the raw material packed layer, and the sintering reaction is advanced by the heat generated by the combustion. Get mine.

[0006]

In this sintering process, in the lower portion of the raw material packed bed, a load called a sinter cake, which has been sintered, is loaded, compressed and densified, resulting in poor air permeability. This reduces the amount of air sucked in and reduces the burning rate of coke, thus lowering the productivity in sinter production.

In order to solve such problems, the inventors have
Japanese Patent Application No. 1-113353 (JP-A-2-293586)
Japanese Patent Application No. 2-293446 (Japanese Patent Application Laid-Open No. 4-168234).
No.) proposed the structure of the sintering pallet for that purpose. However, even in these technologies, there are technical problems to be solved such as not being able to support the sinter cake in just proportion and affecting the yield of the sinter in order to improve the air permeability and productivity. It was

The present invention solves the above problems and provides a sinter machine which can remarkably improve the productivity in the production of sinter by appropriately arranging the sinter cake support members.

[0009]

The feature of the present invention resides in that a supporting member having a sinter cake supporting surface is regularly dispersed on a sintered grate consisting of a pallet group which is connected and runs, and the raw material is charged. The pallet for sintering is characterized in that it is vertically installed so as to be embedded in a layer.

[0010]

The present invention will be described in detail below with reference to preferred embodiments.

1 to 7 show an embodiment of the present invention.

FIG. 1 shows a sintering machine having a trapezoidal shape on a plane parallel to the traveling direction of the pallet 4 of the DL type sintering machine.
FIG. 6 is a side view showing an embodiment in which cake support members (trapezoidal support members) 12 are provided at appropriate intervals in at least one position in the width direction of the pallet 4.

At the position where the pallet 4 approaches the drum feeder 2a provided at the lower portion of the surge hopper 2, the support member 12 is buried in the raw material filling layer 5 charged through the chute 3. Then, the surface layer portion of the raw material packed bed 5 is ignited by the ignition furnace 6, air is sucked to the lower portion of the raw material packed bed to burn the coke in the raw material packed bed, and the sintering reaction proceeds, and the slag ore on the right end side in the figure Mine in position.

FIG. 2 shows the relationship between the support member 12 and the raw material filling layer 5 while the pallet 4 is rotating in the DL type sintering machine, that is, while the sintering reaction is in progress. In this embodiment, one support member 12 is fixed at the central portion in the width direction of the pallet 4 and one fixed at two locations near the pallet side wall 4a are alternated and arranged in a staggered pattern in the traveling direction of the pallet. is doing.

The above description is an example of a sinter machine having a pallet 4 width of 3 m. In the case of a large sinter machine having a pallet 4 width of 5 m, for example, FIG. 3 (b) and FIG. Three
By arranging (c) in combination, the effect of supporting the sinter cake can be improved. In addition, the support material disposition dimension 13d in FIG. 3C is 1/2 of 13b in FIG. 3B.
Is.

The sinter cake 19 formed by the progress of the sintering reaction up to the upper plane (top) of the support member is supported by the upper plane of the support member 12. In this example,
The support members 12 are arranged in a zigzag pattern in the traveling direction of the pallet so that the flat plate-shaped sinter cake 19 is supported without excess or deficiency.

Therefore, since the load of the sinter cake 19 is not applied to the lower raw material filling layer 5 shown in FIG. 2 and the air permeability of the lower filling layer 5 is not impaired, it is possible to manufacture the lower raw material filling layer 5 as compared with the conventional process. The property is greatly improved. In FIG. 2, 4a is a side wall of the pallet 4, 4b is a great bar,
4d is a mainframe.

3A and 3B show a cross section perpendicular to the traveling direction of the pallet 4, and FIG. 3A shows the supporting member 12.
Is provided in the center of the pallet 4 in the width direction, and in FIG. 3B, two support members 12 are provided near the pallet side wall 4a. The dimensions of 13a, 13b, and 13c indicating the fixed position of the support member 12 are 1500 mm, 1500 mm, and 750 mm, respectively.
Is. Further, in this embodiment, the thickness 17a at the top of the support member 12 is the thickness of one great bar 4b, and the thickness 17b at the bottom of the support member 12 is the thickness of two great bars 4b. Is the thickness of.

FIG. 4 is a sectional view parallel to the traveling direction of the pallet 4 showing the mounting state of the support member 12. In this figure, the upper length 14 of the support member 12 is 100 mm,
The inclination angle 15 of the pallet advancing direction is 45 degrees, and the support member 12
The height 16 is about 2/3 of the layer thickness 600 of the raw material filling layer 5
400 mm, the length 18 at the bottom of the support member 12 is
The length is set to 500 mm, which is the same length as the great bar 4b. The support member 12 was attached to the main frame 4d of the pallet 4 similarly to the great bar 4b.

Generally, in a pallet of a large-sized sintering machine, there are three rows of great bars, and in a medium-sized / small-sized sintering machine, there are two rows. In FIGS. 4 and 6, the state of two rows is shown. In this case, the length of the great bar is half the length of the pallet and so is the length of the support member. Therefore, in the case of three rows, the length of the great bar is 1/3 of the length of the pallet.

A preferred range of the inclination angle 15 of the support member in the traveling direction is 40 ° to 50 °. The reason is that the height of the supporting member is determined to be an appropriate value depending on the size of the raw material layer thickness. Generally, the layer thickness depends on the sintering machine and the exhaust air capacity.
It is 00 to 500 mm. In order to support the sinter cake and obtain the effect of improving air permeability, the height of the support member is 2 / of the layer thickness.
Since it is preferably about 3, it is 470 to 330 mm. On the other hand, the upper length of the supporting member is also 10 in order to secure the area necessary to support the sinter cake (not to stick it).
0 mm is required. From the above, FIG.
As shown in (c), the preferred inclination angle 1 of the support member 12 is
A range of 5 was determined.

The other reasons why the trapezoid is formed by providing the inclination angle are as follows.

The area is reduced in order to reduce the adverse effect caused by the provision of the support member (the portion in contact with the support member becomes a raw burning state and the yield decreases) as much as possible.

As a function, unnecessary parts are reduced to reduce the price of the supporting member.

Even when the sinter cake reaches the top of the crushing guide while being fixed to the pallet at the time of mining, the sinter cake is pushed out by the inclined portion of the support member.

Even if the upper part of the support member cannot be supported well due to a decrease in layer thickness due to a large change in operating conditions, it can be expected to support it at the inclined part.

FIG. 6 shows the operation of the support member 12 at the mine section. When the sinter cake 19 approaches the mine discharge position, the space between the pallets 4 is opened, the sinter cake 19 is cracked and divided, and the sinter cake 19 slides from the supporting member 12 in contact with the rotation of the pallet 4. It falls, rides on the preceding support member 12, and then falls while overturning.

In this way, when the sinter cake 19 is dropped and discharged, the sinter cake 19 is easily separated from the support member 12 which rotates with the pallet 4 as one body.

Further, since the sinter cake 19 rides on the preceding supporting member 12 and falls overturned, the falling energy is also reduced. Thus, it is possible to reduce the maintenance cost of the sintering machine and reduce the excessive crushing of the sinter cake.

Regarding the inclination angle of the support member 12 in the anti-traveling direction, it does not make much sense to incline it, but it is better to make it as small as possible (5 to 10 ° or less). The reason is that, as shown in FIG. 7, the sinter cake 19 is divided near the pallets by tilting the pallets on the mine side. At that time, when the inclination angle is large and the rear end of the support member 12 is largely embedded in the sinter cake 19, the mine excretion property is impaired by being caught by the support member 12.

Regarding the preferable positional relationship between the length of the pallet and the support member, for the same reason as above, the pallet is provided on the mine ore side instead of being offset so as to facilitate the ore mine.

[0032]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the flat-shaped sinter cake is supported without excess or deficiency to improve the air permeability of the sinter cake and the raw material packed bed to improve the productivity, and the sinter cake can be removed easily. Since it is easy and the falling energy is also reduced, it is possible to reduce the maintenance cost of the sintering machine and prevent the reduction of the sintering yield.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an operating state of a sintering machine according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a relationship among a support member 12, a raw material filling layer 5 and a sinter cake 19 in FIG.

3 (a), (b) and (c) are cross-sectional views of a pallet perpendicular to the pallet advancing direction, showing how the support member 12 is attached to the grate in the example.

FIG. 4 is a cross-sectional view parallel to the pallet advancing direction showing how the support member 12 is attached to the grate in the embodiment shown in FIG.

5 (a) to (c) are diagrams showing a layer thickness of a sinter cake and a preferable inclination angle 15 of the support member 12, respectively.

FIG. 6 is a view showing the operation of the support member in the mine ore discharging section in the embodiment shown in FIG. 2;

FIG. 7 is a diagram showing an operation of the support member in the ore feeding section in the embodiment shown in FIG. 2;

FIG. 8 is a diagram illustrating a conventional sintering process.

[Explanation of symbols]

 1 Sintering Raw Material 2 Surge Hopper 2a Drum Feeder 3 Chute 4 Pallet 4a Pallet Side Wall 4b Great Bar 4c Side Frame 4d Main Frame 5 Raw Material Packing Layer 6 Ignition Furnace 7 Coke Hopper 8 Limestone Hopper 9 Return Mining Hopper 10 Ore Hopper 11 Mixer 12 Support Member (trapezoidal support member) 13a, 13b, 13c, 13d Dimensions of support member 14 Length of upper part of support member 15 Angle of inclination of support member 16 Height of support member 17a Thickness of top part of support member 17b Support member Thickness of the bottom of the base 18 Length of the support 19 Sinter cake

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsutomu Nakayasu 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Stock Company Kimitsu Steel Co., Ltd.

Claims (1)

[Claims] 1. A support member having a sinter cake support surface is regularly dispersed on a sintered grate made up of a group of pallets that are connected and run, and is vertically installed so as to be embedded in a raw material filling layer. Sintering pallet.