JPH06129775A - Sintered cake supporting and sintering method and sintering pallets for use in the method - Google Patents

Abstract

PURPOSE:To enhance ventilation through a raw material layer disposed in a lower position and improve the productivity by latticing stands which support sintered cake in a downward suction type sintering machine and performing sintering by means of sintering pallets mounting thereon lattice-shaped support stands. CONSTITUTION:Lattice-shaped support stands 1a, 1b are provided in positions of substantially one third of a pallet width over the full length of the pallet. The support stands have a height corresponding to 70% of a thickness of a packed bed, and have the same thickness as that of a fire grate. The lattice- shaped support stands 1a, 1b are interiorly hollow to be less by 45% in surface area than conventional ones. The lattice-shaped support stands 1a, 1b are provided on all the pallets. Therefore, sintering by means of the pallets is favorably performed near the surface of the stands to improve the productivity since ventilation through the packed bed is not hindered and the surface area of the stands is made small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintering cake supporting sintering method which is a method for producing a sintered ore which is a raw material for iron making in a blast furnace or the like, and a sintering pallet used therefor.

[0002]

2. Description of the Related Art A conventional sinter production process is shown in FIG. 4 and a sinter pallet is shown in FIG.

In FIG. 4, ore as a main raw material for producing a sintered ore is carried from the yard to the ore hopper 13, limestone as a sub raw material is carried to the hopper 11, and coke as fuel is carried to the hopper 10. Ore, limestone, and coke were cut from the hopper, and with the return ore cut from the return hopper 12,
The material is conditioned and granulated by the mixer 14 and used as a raw material. The granulated raw material 5 is conveyed to the surge hopper 6 and stored, then cut out from the drum feeder 7 and passed through the chute 8 to the pallet 2
Then, the filling layer 9 is formed. In the case of a sintering process using iron ore as the main raw material, the thickness of the raw material packed layer is usually 600m.
It is about m. Ignition furnace 15 is attached to the coke on the surface of the packed bed.
At this point, the coke in the upper part of the packed bed is ignited by the heat of combustion of the gas, the coke is burned while sucking air downward, and the raw material is sequentially sintered from the upper layer to the lower layer by this combustion heat.

According to such a conventional method, the lower layer of the raw material filling layer is a sintered lump integrated with the sintered pallet after sintering (hereinafter, a sintered lump integrated with the sintered pallet after sintering is sintered). It is compressed to a high bulk density. As a result, the ventilation becomes poor and the ventilation becomes uneven. As a result, the amount of air sucked into the raw material packed bed is reduced, and uneven ventilation occurs. As a result, the burning rate of coke is reduced, and uneven combustion occurs. As a result, the sintering rate becomes low, and the yield (yield of a product having a size of 5 mm or more) is lowered, so that there is a problem that productivity is lowered.

As a method for solving the decrease in productivity, there is a method of adding quick lime as a binder for coarsening the raw material for the purpose of improving the ventilation of the raw material packed bed.
However, quick lime has a problem that it is expensive and the manufacturing cost is high.

Further, the inventors of the present invention have proposed a sintering cake supporting and sintering method using a stand as disclosed in Japanese Patent Laid-Open No. 4-168234 as a technique for improving the productivity by eliminating the load of the sintering cake and improving the ventilation of the sintered layer.

FIG. 5 shows a sintering pallet in which the supporting stands 4a and 4b are installed by this sintering cake supporting sintering method. The support stand 4 is 70% of the packed bed thickness 600 mm.
The height is 420 mm. When the sintering progresses and the sinter cake is formed up to the position of 420 mm in height of the support stand, the sinter cake is supported by the upper end portion of the support stand and the lower layer is not loaded. Therefore, no load is applied to the lower raw material filling layer, and ventilation of the sintered layer is improved. However, in the sintering cake supported sintering method using this stand, the temperature rise near the stand surface is insufficient due to heat removal from the surface of the stand and due to excessive ventilation of the boundary between the stand and the packed bed, so that the sintering process is not performed sufficiently. There is a problem that the yield is reduced and the productivity is reduced.

[0008]

In the sintering according to the conventional technique, the ventilation of the lower layer is obstructed, and in the sintering method of sintering the sintering cake, the productivity is lowered because the temperature rise near the surface of the stand is insufficient. There's a problem.

[0009]

[Means for Solving the Problems]

The first aspect of the present invention for solving the above-mentioned problems is characterized in that the stand for supporting the sinter cake of the lower suction type sintering machine is formed in a lattice shape, and sintering is performed by a sintering pallet provided with the lattice-shaped stand. And a sintering cake supporting sintering method.

A second aspect of the present invention is a sintering pallet characterized in that the stand for supporting the sinter cake of the lower suction type sintering machine is formed in a lattice shape, and the lattice-shaped stand is installed.

[0012]

In the present invention, the stand for supporting the sinter cake has a lattice shape, so that the surface area is smaller than that of the stand for supporting the conventional plate-like sinter cake, and the heat removal from the stand surface and the stand Excessive ventilation at the boundary of the packed bed is prevented, whereby sintering can be performed without obstructing the ventilation of the packed bed in a state where the temperature near the surface of the stand can be sufficiently increased.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention will be described in detail below with reference to FIGS.
The sintering process is the same as the conventional method shown in FIG. 4, and the layer thickness is 600 mm.

Embodiment 1 FIG. 1 shows a pallet 2 on which grid-like support stands 1a and 1b are installed as an embodiment of the present invention. The grid-shaped support stands 1a and 1b were installed at a position of 1400 mm from the pallet side wall of approximately 1/3 of the pallet width of 4 m toward the center and in the longitudinal direction of the pallet over the entire length of the pallet. The height of the grid-shaped support stands 1a and 1b is 70 mm with a packing layer thickness of 600 mm.
% Of 420 mm. In addition, the grid-shaped support stand 1a,
The thickness of 1b is 25 mm, which is the same as the grate 3. The lattice-shaped support stands 1a and 1b are hollowed out as shown in FIG. 1, and the surface area is 65%, which is 45% smaller than the surface area of the support stand of the conventional sintering cake support sintering method. The support stands 1a and 1b are installed on all pallets.

The sintering with this pallet does not hinder the ventilation of the packed bed and the surface area of the stand is small, so that the vicinity of the stand surface is also sintered well, and the productivity of the conventional sintering method supporting sintering is improved. 35.5t / d /
compared to m ^2, the productivity of the sintering process of sintering pallets according to the invention, 40.7t / d / m ² and 4.2t / d / m ²
Improved.

Embodiment 2 As another embodiment of the present invention, a grid-shaped support stand 1a, 1
FIG. 2 shows the pallet 2 in which b is installed. The grid-shaped support stands 1a and 1b were installed at a position of 1400 mm from the pallet side wall of approximately 1/3 of the pallet width of 4 m toward the center and in the longitudinal direction of the pallet over the entire pallet length. The height of the lattice-shaped support stands 1a and 1b is 420 mm, which is 70% of the filling layer thickness of 600 mm. Moreover, the grid-shaped support stand 1
The thickness of a and 1b is 25 mm, which is the same as that of the grate 3. The lattice-shaped support stands 1a and 1b are gear-shaped and hollowed out to have a surface area of 45%, which is 55% less than the surface area of the support stand of the conventional sintering cake support sintering method. The support stands 1a and 1b are installed on all pallets.

Sintering with this pallet does not hinder the ventilation of the packed bed, and the surface area of the stand is small, so that the vicinity of the stand surface is also sintered well, and the productivity of the conventional sintering method supporting sintering is improved. 35.5t / d /
compared to m ^2, the productivity of the sintering process of sintering pallets according to the invention, 41.8t / d / m ² and 5.3t / d / m ²
Improved.

Embodiment 3 As another embodiment of the present invention, a grid-shaped support stand 1a, 1
The pallet 2 in which b is installed is shown in FIG. The grid-shaped support stands 1a and 1b were installed at a position of 1400 mm from the pallet side wall of approximately 1/3 of the pallet width of 4 m toward the center and in the longitudinal direction of the pallet at a length of 2/3 of the total length of the pallet. The height of the lattice-shaped support stands 1a and 1b is the filling layer thickness 6
It is 420 mm, which is 70% of 00 mm. The thickness of the lattice-shaped support stands 1a and 1b is 25 mm, which is the same as that of the grate 3. The lattice-shaped support stands 1a and 1b have a trapezoidal shape and are hollowed out to have a surface area of 35%, which is 65% smaller than the surface area of the support stand of the conventional sintering cake support sintering method. The support stands 1a and 1b are installed on all pallets.

Sintering with this pallet does not hinder the ventilation of the packed bed and the surface area of the stand is small, so that the vicinity of the stand surface is also sintered well and the productivity is improved by the conventional sintering cake supporting sintering method. Productivity of 35.5
Compared with t / d / m ² , the productivity of the sintering method of the sintering pallet according to the present invention is 43.1 t / d / m ² and 6.6 t / d.
/ M ² improved.

[0019]

As described above, according to the present invention, the ventilation and the yield of the lower raw material filling layer are improved, and the productivity is improved. Compared with the conventional method, 4.2 t / d / m ^{2 to} 6.6 t
/ D / m ² improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment in which a sinter cake support stand of the present invention is installed.

FIG. 2 is a perspective view showing a second embodiment in which the sinter cake support stand of the present invention is installed.

FIG. 3 is a perspective view showing a third embodiment in which a sinter cake support stand of the present invention is installed.

FIG. 4 is a diagram showing a conventional sintering process.

FIG. 5 is a diagram showing a state of a pallet in which a conventional sinter cake support stand is installed.

[Explanation of symbols]

 1a, 1b Lattice support stand 2 Pallet 3 Grate 4a, 4b Conventional support stand 5 Sintering raw material 6 Surge hopper 7 Drum feeder 8 Chute 9 Raw material filling layer 10 Coke hopper 11 Limestone hopper 12 Return ore hopper 13 Ore hopper 14 Mixer 15 ignition furnace

Claims (2)

[Claims] 1. A sintering cake supporting and sintering method, characterized in that a stand for supporting a sinter cake of a lower suction type sintering machine is formed into a lattice shape, and sintering is carried out by a sintering pallet provided with the lattice-like stand. 2. A sintering pallet characterized in that a stand for supporting the sinter cake of the lower suction type sintering machine is formed in a grid shape, and the grid-shaped stand is installed.