JP2715218B2 - Pallets for sintering - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintering pallet for use in, for example, an iron ore sintering machine.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional sinter production process.

[0003] The ore, which is the main raw material for sinter production, is cut out from the hopper 10, the limestone, which is the auxiliary raw material, is cut out from the hopper 8, the ore return is cut out from the hopper 9, and the coke fuel is cut out from the hopper 7. Humidity control and granulation are performed to obtain a sintering raw material 1.

[0004] The sintering raw material 1 is conveyed from a mixer 11 to a surge hopper 2 by a belt conveyer and stored, then cut out by a drum feeder 2a, loaded on a pallet 4 of a sintering machine via a chute 3, and The raw material 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 5 is usually about 600 mm.
In the sintering machine, coke in the raw material packed bed 5 is burned while sucking air below the raw material packed bed by the ignition furnace 6, and the sintering reaction is advanced by heat of the combustion to obtain sinter.

[0006]

In the sintering process, a lower portion of the raw material packed layer is loaded by a sintered mass called a sinter cake, compressed and densified, resulting in poor air permeability. As a result, the amount of sucked air is reduced, the burning rate of coke is reduced, and the productivity of sinter production is reduced. For this reason, the present inventors have invented a pallet for sintering in which a supporting member having a sinter cake supporting surface is vertically suspended (Japanese Patent Application No. 2-29344).
No. 6).

An object of the present invention is to provide a sintering pallet for a sintering machine which can improve the above-mentioned invention and greatly improve the productivity in the production of sinter.

[0008]

According to the present invention, a sinter cake supporting member having a height of 50% or more and 75% or less of the height of a raw material filling layer in a pallet is provided on a pallet for sintering. A pallet for sintering, wherein the pallet is vertically installed so as to be buried in a raw material filling layer in parallel to a direction.

[0009]

Hereinafter, the operation of the present invention will be described in detail with reference to examples.

FIG. 1 shows an embodiment of the present invention.

FIG. 1 shows a sinter cake supporting member 12 having a trapezoidal shape parallel to the running direction of the pallet 4 on at least one location in the width direction of the pallet 4 on the grate forming the bottom surface of the pallet 4 of the DL type sintering machine. It is a side view which shows the embodiment provided at the appropriate intervals above.

At a position where the pallet 4 has reached below the drum feeder 2 a provided below the surge hopper 2, the support member 12 is buried in the raw material filling layer 5 charged via the chute 3. Next, the surface layer of the raw material filling layer 5 is ignited by the ignition furnace 6, air is sucked into the lower part of the raw material filling layer 5, and the coke in the raw material filling layer 5 is burned to cause a sintering reaction to proceed. Exhaust at the ore location.

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, the support member 12 is fixedly provided at a central portion of the pallet 4 in the width direction.

The sinter cake 14 formed by the sintering reaction progressing to the upper plane (top) of the support member 12 is supported by the upper plane 12A of the support member, and the raw material filling layer 5 is formed.
Since the load applied to the lower portion by the sinter cake 14 is reduced and the air permeability of the lower portion of the packed layer 5 is not impaired, the productivity is greatly improved. 4a is pallet 4
4b is a great bar, and 4d is a main frame.

FIG. 3 is a sectional view showing a section perpendicular to the traveling direction of the pallet 4.

FIG. 4 shows the sintering progress speed (FFS) of an experiment in which the height 13 of the support member of the pallet 4 was changed when the layer thickness was 600 mm. The vertical axis represents the improvement margin of FFS, that is, the ratio of the sintering using the sintering pallet with the support member 12 fixed to the sintering pallet without the support member fixed to the FFS. , The horizontal axis is the support member height 1
3 is shown.

FIG. 4 shows that when the height of the supporting member is less than 50% of the height of the raw material packed layer, that is, 300 m for a layer thickness of 600 mm.
No improvement in FFS is seen at support member heights less than m.

FIG. 5 shows the support member 12 on the pallet 4.
Is 450 mm for a sinter cake supporting less than 25% of the layer thickness of the raw material packed layer.
The support member 12 and the raw material-filled layer 5 in the middle of the sintering reaction in the case where the diameter is more than mm are shown. Since the support member 12 only locally supports the upper layer of the sinter cake 14, a large crack is formed on the surface of the sinter cake 14. The large cracks disturb the progress of sintering and do not lead to an improvement in productivity.

[0019]

According to the present invention, it is possible to provide an optimum height of the support member vertically suspended on the pallet, improve the permeability of the sinter cake, and improve the productivity.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an operation state of a sintering machine using an embodiment of the present invention.

FIG. 2 is a perspective view showing a support member, a raw material filling layer, and a sinter cake in FIG.

FIG. 3 is a cross-sectional view perpendicular to a pallet advancing direction showing a mounting state of a support member to a great in the embodiment shown in FIG. 1;

FIG. 4 is a view showing the effect of the height of a support member on the sintering progress speed.

FIG. 5 is a perspective view showing the relationship between the support member, the raw material filling layer, and the sinter cake at a support member height of 450 mm.

FIG. 6 is a diagram illustrating a conventional sintering step.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sintering raw material 2 Surge hopper 2a Drum feeder 3 Chute 4 Pallet 4a Side wall 4b Great bar 4c Side frame 4d Main frame 4e Insulation piece 5 Raw material filling layer 6 Ignition furnace 7 Hopper 8 Hopper 9 Hopper 10 Hopper 11 Mixer 12 Sinter cake support Member 12A Upper plane of support member 13 Support member height 14 Sinter cake

Continued on the front page (72) Inventor Kenro Nozaki 1 Kimitsu, Kimitsu City, Chiba Prefecture Nippon Steel Corporation Kimitsu Works (72) Inventor Takashi Terada 1 Kimitsu, Kimitsu City, Chiba Prefecture Nippon Steel Corporation Kimitsu Corporation Inside the ironworks (72) Inventor Tadahiro Inazumi 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (72) Inventor Masami Fujimoto 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation (72) Inventor Masanori Kobayashi 1 Kimitsu, Kimitsu-shi, Chiba Prefecture Nippon Steel Corporation Kimitsu Works

Claims (1)

(57) [Claims] 1. A sinter cake supporting member having a height of 50% or more and 75% or less of a height of a raw material filling layer in a pallet is provided on a pallet for sintering in parallel with a traveling direction of the pallet. A sintering pallet characterized by being vertically buried.