JP2881202B2 - Air permeability adjustment device for sintered layer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for adjusting the permeability of a sintered layer.

(Prior Art) In a method for producing sintered ore from fine ore, a carbon material as a fuel such as coke powder and limestone as an auxiliary material are mixed with fine iron ore, and the mixture is granulated and mixed. (Hereinafter referred to as “raw material”) is charged into a sintering pallet to form a raw material packed layer (hereinafter simply referred to as “filled layer”).

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

In this case, the lower layer of the packed layer is compressed under pressure by the weight of an integrated sintered mass (hereinafter referred to as a sinter cake) of the sintered pallet in which the sintering of the upper layer has been completed. become worse. For this reason, the suction amount of air into the packed bed is reduced, and the combustion speed of coke is reduced, so that the productivity is reduced.

Therefore, the present inventors charge the sintering raw material into the sintering pallet in which the convex support is attached on the bottom surface of the sintering pallet and / or the inner wall of the pallet, and then ignite and sinter the raw material filling layer. Operation method and on the bottom of the sintered pallet and / or
Alternatively, the applicant has filed a Japanese Patent Application No. 1-1113353 for a technique for improving productivity by improving the ventilation of the lower layer using a sintered pallet provided with a convex support on the inner wall of the pallet. (FIG. 4) (Problems to be Solved by the Invention) When the operation is performed by a conventional sintering pallet having a convex support 7 provided on the bottom surface of the sintering pallet 4 according to the conventional technique shown in FIG. When the sinter cake 18 is detached from the sintering pallet, the convex support 7 is easily damaged when the sinter cake 18 is detached from the sintering pallet. There are operational problems such as large sinters and bedrock spills.

Therefore, the present invention provides a method for easily removing a sinter cake from a convex support at the time of mining, and smoothly rotating the convex support of a pallet without notching the interference portion of a crushing guide or a floor hopper. The purpose is to enable stable and high-productivity operation.

(Means for Solving the Problems) According to the present invention for achieving the above object, a plurality of convex supports projecting from the surface of a great bar are provided so as to be tiltable with respect to a pallet. This is a layer air permeability adjusting device.

(Examples) Details of the present invention will be described with reference to the illustrated examples. FIG. 1 is a perspective view illustrating the present invention, FIG. 2 is an enlarged view of a main part thereof, and FIG. 3 is a view showing the movement of the present apparatus when orbiting a DL type sintering machine.

A pair of special great bars 10 having a concave cross section is provided, in which a pin 8 having a weight 5 fixed to a convex support 7 fixed by a chain 6 is mounted so as to protrude from a surface of a great bar 9 mounted on a pallet 4. The sintering pallet 4 is provided with a plurality of shafts 11 which are tiltably mounted in the shaft holes 11.

The convex support 7 is made of a heat-resistant cast steel which stands upright at about 2/3 of the layer height so as to support the sintering cake 18 on the upper part of the sintering layer which is being sintered in the sintering pallet 4 from below. The pin 8 and the plate-like arm 13 are fixed to the lower part by a square member. The weight 5 has a sufficient weight to follow the tilt of the convex support 7 and to stand upright, and is connected by a chain 6 to an arm 13 located at the lower end of the convex support 7.

The special grade bar 10 is provided with a step having a concave cross section over the entire length so that the convex support 7 is tilted and accommodated in the upper part, and a gap is formed in the lower part so that the arm 13 can be tilted and passed.

Three air permeability adjusting devices having such a configuration are provided in the width direction of each pallet 4.

Next, the operation when the air permeability adjusting device goes around the DL type sintering machine will be described with reference to FIG.

First, the convex support 7 that has reached the floor bedding hopper 14 gradually tilts from the state of being erected by the weight 5 while interfering with the end of the hopper 14, and falls down the lower part of the hopper horizontally, and then opens. It is erect again. The lower part of the charging chute 15 is buried in the raw material 18 to be charged in an upright state, and supports the sintered cake 12 formed on the upper part of the convex support member 7 in the course of ignition and firing. To act so that no load is applied.

In this way, the sintering of the sintered pallet 4 is performed while the sintering pallet 4 is tilted, and the sintering cake is slid off the convex support 7 in the ore mining part, and the ore is discharged. Maintained vertically. Next, the convex support 7 approaching the crushing guide 17 is tilted and stored in the space between the special great bars 10, passes through, and returns to the mineral supply side while hanging downward on the return side.

In the above embodiment, the weight is used to make the convex support rotatable. However, the weight is not limited thereto, and for example, a spring method may be used. The material of the convex support is heat-resistant cast steel. However, the material is not limited thereto, and any material may be used as long as it is excellent in heat resistance and wear resistance.

By continuously supporting the sintered cake in this manner, the air permeability of the lower layer portion was improved, and it was possible to improve the productivity by about 30% as compared with the case not according to the present invention.

(Effects of the Invention) As described above, in the apparatus of the present invention, since the tiltable convex support is provided, it passes through the interference portion of each part of the sintering machine without any problem, and also at the time of mining. By following the sliding of the sinter cake and supporting the upper cake during sintering, the air permeability of the lower layer can be improved, and the productivity can be greatly improved without lowering the quality and yield.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating the present invention, FIG. 2 is an enlarged view of a main part thereof, FIG. 3 is a view showing the movement of the present apparatus when orbiting a DL type sintering machine, FIG. FIG. 1 is a perspective view showing a convex support according to an embodiment of the prior art. 4 Sintered pallet 5 Weight 6 Chain 7 Convex support 8 Pin 9 Great bar 10 Special great bar 12 Sinter cake 13 Arm

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masami Fujimoto 1-1-1 Edamitsu, Yawatahigashi-ku, Kitakyushu-shi, Fukuoka Prefecture Nippon Steel Corporation 3rd Research Institute (72) Inventor Tadahiro Inazumi Kitakyushu, Fukuoka Prefecture 1-1-1 Edamitsu, Yawata-Higashi-ku Nippon Steel Corporation 3rd Technical Research Institute (72) Inventor Tsutomu Hatano 1 Kimitsu, Kimitsu City, Chiba Prefecture Kimitsu Works, Nippon Steel Corporation (58) Field (Int.Cl. ⁶ , DB name) F27B 21/08

Claims (1)

(57) [Claims] 1. An apparatus for adjusting air permeability of a sintered layer, wherein a plurality of convex supports projecting from the surface of a great bar are provided so as to be tiltable with respect to a pallet.