JPH059605A - Regulator of permeability in sintered layer - Google Patents

Abstract

PURPOSE:To enhance the combustion velocity of coke and to realize sintering operation with high degree of production at high yield by improving the permeability of a sintering reaction zone in the case of producing sintered ore. CONSTITUTION:A rectangular supporting material 8 of sintered cake is projected to a sintering layer from the direction of the bottom face of a sintering pallet and provided parallel to the advancing direction of the pallet. A slit of is provided parallel to the advancing direction of the pallet in the part for fitting the pallet to the supporting material 8. Thereby the supporting range of sintered cake in the supporting material is widened and moreover release between sintered cake and the supporting material is made easy. The adverse effect on the sintering status caused by inhibition of the flow of sucked air is prevented by the slit provided in the part for fitting the pallet to the supporting material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered layer air permeability adjusting device.

[0002]

2. Description of the Related Art In a method for producing sinter ore from powdered ore, powdered iron ore is blended with a carbonaceous material as a fuel, for example, coke powder and limestone powder as an auxiliary raw material, and mixed and granulated. (Hereinafter, referred to as a raw material) is charged into a sintering pallet to form a raw material filled layer (hereinafter simply referred to as a filled layer).

The surface layer of the packed bed is ignited, the coke powder in the raw material is burned while sucking air downward, and the raw material is sintered by the heat of combustion.

In this case, the lower layer of the packing layer has a high bulk density because it is compressed by being pressed by the weight of the sintered lump (hereinafter referred to as a sinter cake) which is integrated after the sintering of the upper layer is completed, and has aeration. become worse. As a result, the amount of air sucked into the packed bed is reduced, and the coke burning rate is reduced, resulting in reduced productivity.

Therefore, the inventors of the present invention first charged the raw material into a sintering pallet provided with a rectangular support material projecting from the bottom surface of the sintering pallet and attached to the sintering layer, and then filling the packed bed with the raw material. The operation method of igniting and sintering, and the productivity improving technology by improving the air permeability of the lower layer by the sintering pallet attached with the rectangular support material protruding from the bottom direction of the sintering pallet to the sintering layer are specified. Filed as Japanese Patent Application No. 2-293446.

FIG. 7 is a diagram for explaining the operation of the rectangular support member. When the sinter cake 7 approaches the ore discharge section by the rotation of the pallet 4, a crack is generated between the pallets and the pallets are divided. Thereafter, the sinter cake 7 is peeled off from the rectangular support member 8 by the tilting of the pallet 4 and falls.

[0007]

As shown in FIG. 7, when a rectangular support material 8 is attached on the bottom surface of the sintering pallet, the side surface of the support material 8 is rectangular and the progress for one pallet is advanced. Since it is installed over the length of the direction, the support range of the sinter cake 7 is wide and the sinter cake 7
Since it becomes easy to separate the support material 8 from the support material 8, the effect of improving the production rate by improving the air permeability can be easily exhibited. However, since the height of the support material 8 occupies 2/3 of the height of the charging raw material layer,
When the mounting portion of the support material 8 to the pallet 4 is designed so as to sufficiently withstand the own weight of the support material 8 or the mechanical impact at the time of sinter cake mining, the width in the pallet width direction is about 5 times the width of the great bar. It grows considerably. for that reason,
In the vicinity of the support material, the flow of sucked air into the packed bed was obstructed as compared with the great bar portion, and there was a risk of adversely affecting the firing condition.

[0008]

SUMMARY OF THE INVENTION The gist of the present invention is that a pallet mounting portion of a rectangular sinter cake support member is projected from the bottom surface direction of the sinter pallet to the sinter layer and installed parallel to the pallet traveling direction. A breathability adjusting device for a sintered layer, characterized in that slits are provided parallel to the direction.

[0009]

The operation of the present invention will be described in detail with reference to the illustrated embodiment.

FIG. 5 is a cross-sectional view showing a side surface state in which the apparatus for adjusting the air permeability of the sintered layer of the present invention orbits on the Dwightroid type sintering machine. The support material 8 that supports the sinter cake of the pallet 4 that has reached the bottom of the drum feeder 2 is buried in the raw material charged through the chute 3. Support material 8
The coke on the surface layer of the packed bed 5 in which is buried is ignited, the combustion of the coke is propagated by the air sucked downward, the coke is burned by the combustion heat, and the sinter cake 7 is discharged at the same time as the completion of the sintering.

FIG. 6 shows a pallet 4 in which sintering of the supporting material 8 is in progress.
Show the installation status on top. The support members 8 are installed in three rows at equal intervals in the width direction of the pallet 4. The support material 8 supports the weight of the sinter cake 7 formed by sintering up to the top of the support material 8. Therefore, the lower packed layer 5
By reducing the load applied to the belt, deterioration of breathability can be prevented, and productivity can be improved.

FIG. 4 is a front view of the pallet on which the supporting member 8 is installed, and FIG. 3 is a side view of mounting the supporting member 8 on the pallet main frame 4d. The support member 8 has a jaw-shaped bottom portion like the normal great bar 4b, and is installed on the pallet main frame 4d. As shown in FIGS. 3 and 1, the cross section of the support member 8 is a trapezoid having a lower thickness 8c of 40 mm and an upper thickness 8b of 30 mm. Support material side length 8
e is the length of one great bar 4b, and its height 8a is a rectangle that is 2/3 of the height of the charging raw material layer.
Since the side shape of the support material 8 is rectangular, the range for supporting the weight of the sinter cake 7 after completion of firing is expanded, and the effect of improving the air permeability of the sintering bed is increased. The bottom width 8d of the support material is set to 5 great bars 4b in order to maintain its own weight and strength enough to withstand mechanical impact at the time of sinter cake mining. In this way, the bottom width of the support material is 8
Since d is as wide as five great bars 4b, and there is a concern that the flow of suction air is blocked near the supporting material 8 to adversely affect the firing condition, the slit 8f is formed on the bottom of the supporting material 8. Apply. As shown in FIG. 1, the slit 8f
Are provided in two rows in the pallet width direction, and their width 8g is 5mm
Is. Further, as shown in FIG. 2, the slits 8f are provided in two rows in the bottom of both sides of the support member 8 in the pallet advancing direction, and the length 8h thereof is 1/3 of the length of the great bar 4b. Here, heat-resistant cast steel was used as the material of the support material 8,
The material is not limited to this, and any material may be used as long as it has excellent heat resistance and wear resistance.

[0013]

As described above, according to the present invention,
Since the side surface of the support material is rectangular, the support range of the sinter cake is wide and the support material can be easily separated from the support material, and at the same time, a slit is formed in the pallet mounting portion of the support material in parallel with the pallet traveling direction. Since it is provided, it is possible to prevent an adverse effect on the firing condition due to the obstruction of the flow of suction air. Therefore, the effect of improving the production rate by improving the air permeability of the raw material filling layer of the support material can be more easily exhibited.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a support material according to the present invention.

FIG. 2 is a view of the support material according to the present invention as viewed from above.

FIG. 3 is a side view showing a state in which a support material is attached to a pallet main frame.

FIG. 4 is a front view of a pallet in which a support material is installed.

FIG. 5 is a side view showing a situation in which a pallet goes around a Dwightroid-type sintering machine.

FIG. 6 is a diagram showing a situation where the support material is installed on the pallet while the pallet is orbiting the Dwightroid-type sintering machine.

FIG. 7 is a diagram illustrating the operation of a support material.

[Explanation of symbols]

 1 Surge Hopper 2 Drum Feeder 3 Chute 4 Pallet 4a Side Wall 4b Great Bar 4c Side Frame 4d Pallet Main Frame 5 Packing Bed 6 Ignition Furnace 7 Sinter Cake 8 Support Material 8a Support Material Height 8b Support Material Upper Thickness 8c Support Material Lower Thickness 8d Supporting material bottom width 8e Supporting material side surface length 8f Slit 8g Slit width 8h Slit length

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenro Nozaki 1 Kimitsu, Kimitsu-shi, Chiba Shin Nippon Steel Co., Ltd. within the Kimitsu Steel Works (72) Inventor Takashi Terada 1 Kimitsu, Chiba Prefecture New Japan Steel Corporation Kimitsu Inside the steelworks

Claims (1)

Claim: What is claimed is: 1. A rectangular sinter cake support member, which projects from the bottom surface of the sintering pallet toward the sintered layer and is installed parallel to the pallet advancing direction, is installed parallel to the pallet advancing direction. An apparatus for adjusting the air permeability of a sintered layer, which is provided with slits.