JPH109771A - Apparatus for adjusting bulk density of sintering raw material layer - Google Patents

Abstract

(57) Abstract: The present invention aims to reduce the bulk density of a formed sintering raw material layer when charging and filling a sintering raw material on a pallet of a DL type sintering machine. An object is to provide an effective bulk density adjusting device for a sintering raw material layer. SOLUTION: A drum feeder for cutting a sintering raw material;
Distributing the cut-out sintering raw material on a pallet, a charging chute for depositing the sintering raw material,
At a position corresponding to the inside of the sintering raw material during the deposition and the layer immediately after the completion of the deposition, the flat plate which is vertically movable and / or movable back and forth in the pallet advancing direction is provided horizontally. It is a device for adjusting the bulk density of a sintering raw material layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for adjusting the bulk density of a sintering raw material layer, and more particularly, a sintering raw material is charged into a DL (abbreviated Dwight Lloyd) type sintering machine and filled on a pallet. When the layer is formed, reduce the bulk density of the sintering raw material layer,
The present invention relates to a technique for improving the air permeability of the sintering material layer.

[0002]

2. Description of the Related Art The production of sinter using a DL type sintering machine is as follows.
As is well known, a granular sintering raw material (hereinafter often referred to simply as “raw material”) containing a carbon material is supplied from a surge hopper onto a pallet that is driven to rotate in an endless manner, and a packed bed (hereinafter referred to as “raw material layer”) is provided. ), And ignites the surface of the raw material layer with an ignition furnace having a plurality of combustion burners arranged in the width direction of the pallet, and suctions air from a wind box arranged below the pallet to form a sintering machine. This is performed by sintering the raw material while moving to the terminal end side of the material. This D
In the case of an L-type sintering machine, the raw material layer formed on the pallet has a layer thickness of about 500 to 600 mm, coarse particles are distributed in the lower layer, fine particles are distributed in the upper layer, and so-called segregation in the vertical direction. Has occurred. In addition, the lower part of the raw material layer has a larger drop from the chute at the time of loading than the upper part, and receives the load of the upper part, so that the bulk density is increased and the air permeability is significantly reduced. Therefore, conventionally, it is effective to improve the air permeability of the raw material layer, especially the air permeability of the lower layer portion, and reduce the difference in air permeability between the upper layer portion and the lower layer portion, thereby improving the productivity, quality and yield of the sinter. R & D of specific countermeasures is being carried out in many cases.

One of them is disclosed in Japanese Patent Laid-Open Publication No.
The publication discloses that a plurality of bars are arranged in a row in a mining part in a direction coinciding with the direction of travel of a pallet, and a material dropped from a chute is caused to collide with the bars once to reduce the falling speed. Thus, a technique for preventing an increase in the bulk density of the lower layer was proposed.
However, in the above technique, only the raw material that collides with the rod decreases the falling speed and exhibits a loose filling effect, but the raw material that falls without colliding exhibits the same dense packing effect as before. If the interval between the rods is narrowed as a countermeasure, there is a possibility that the raw material is clogged and the charging of the raw material becomes unstable. In addition, in this technique, the raw material is locally charged more or less, and a difference in bulk density occurs in the raw material layer, which may eventually adversely affect the sintering yield. Further, there is a problem that the effect of increasing the bulk density of the lower layer due to the load of the upper layer cannot be suppressed.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention is to load a sintering raw material on a pallet of a DL type sintering machine.
It is an object of the present invention to provide a sintering raw material layer bulk density adjusting device that is effective in reducing the bulk density of a formed sintering raw material layer when filling.

[0005]

Means for Solving the Problems In order to achieve the above object, the inventor has diligently pursued a cause for increasing the bulk density of a raw material deposited on a pallet, and has obtained the following knowledge. First,
Regions where the phenomenon affecting the bulk density of the sintering raw material layer occurs are the three regions shown in FIG. In the area A, the raw material falling from the charging chute collides with the layer that has dropped and accumulated first. The energy of the collision causes deformation of the layer, and propagation of the energy in the lower direction (indicated by an arrow) and the weight of the upper layer promotes the compaction of the middle and lower layers (region B). . In the region C, the raw material flows without interruption along the slope, and piles up from the lower layer while repeatedly colliding with the previously deposited layer. The collision compacts the material. There, finally, the material is piled up to the sintering deposition thickness more than the angle of repose of the raw material, and then the layer collapses due to the avalanche phenomenon and further consolidation.

[0006] Based on this finding, the inventor considered that the technique using the rod described above was insufficient to prevent an increase in bulk density, and focused on the use of a flat plate. That is, the present invention provides a drum feeder for cutting a sintering raw material,
Distributing the cut-out sintering raw material on a pallet, a charging chute for depositing the sintering raw material,
At a position corresponding to the inside of the sintering raw material during the deposition and the layer immediately after the completion of the deposition, the flat plate which is vertically movable and / or movable back and forth in the pallet advancing direction is provided horizontally. It is a device for adjusting the bulk density of a sintering raw material layer.

In the present invention, since the sintering material layer bulk density adjusting device is configured as described above, the sintering material can be deposited on the pallet at a low speed, the load on the upper layer can be reduced, and the bulk density can be reduced. Can be eliminated.

[0008]

1 and 2 show an apparatus for adjusting the bulk density of a sintering raw material layer according to the present invention. As shown in FIGS. 1 and 2, a drum feeder 2 for cutting out a powdery and granular sintering material containing a carbonaceous material stored in a surge hopper 1.
And a so-called ore supply unit consisting of a charging chute 3 for distributing the cut-out raw materials on a pallet of a sintering machine. The additionally provided portion is a flat plate that can freely move up and down and move back and forth in the pallet advancement, and is provided horizontally and in some cases in multiple stages. This prevents the raw material 4 falling from the charging chute 3 from being consolidated when the raw material 4 drops and collides with the raw material layer 5 that has been deposited first, or the bulk density of the lower layer is reduced by the load of the upper layer. The increase can be suppressed.

That is, in order to alleviate the impact caused by the raw material falling from the charging chute 3 and prevent the impact from propagating to the lower layer, the flat plate 7 is placed at a position corresponding to the raw material flow during sliding down the deposition layer 5 and its slope. Before installation and starting of raw material charging, positioning is performed by moving in the vertical direction and the front and rear direction of pallet advancement so that the bulk density becomes an appropriate value. Further, in order to suppress an increase in the bulk density of the lower layer due to the load of the upper layer, a plurality of flat plates 7 are provided in the height direction of the deposition layer. In particular, in order to prevent the raw material from flowing down on the slope 5 ′ of the sedimentary layer and to prevent the consolidation due to the avalanche and reduce the bulk density, the flat plate 7 is used.
The projecting only L ₂ from the inclined surface portion 5 ', thereby also reducing the avalanche preventing material falling speed. The position of collision with the sedimentary layer 5 and the ridgeline of the slope 5 ′ differ depending on the operating conditions (for example, the amount of ore supply, layer thickness, pallet speed, etc.), so that the position of the flat plate 7 in the height direction and the protruding length from the slope 5 ′. is L _2, it is necessary to change the operational conditions. Therefore, the flat plate 7
A vertically moving means 9 and a moving means 10 for moving the pallet in the traveling direction are provided, and they are adjusted to set the position of the flat plate.

[0010]

EXAMPLE A DL type sintering machine with an effective area of 400 m ² was prepared as shown in Table 1.
Using the raw materials shown in Table 2, sintered ores were produced under the flat plate setting conditions (six levels from base to case 5) of the adjusting device according to the present invention shown in Table 2. The results are collectively shown in Table 3.

[0011]

[Table 1]

[0012]

[Table 2]

[0013]

[Table 3]

As is clear from Table 3, when the depth of the flat plate 7 arranged on the upper part into the layer increases (from case 1 to case 3), the bulk density of the raw material layer decreases. But,
When the depth becomes 100 mm or more (case 2 to case
4), the change in bulk density is small. That is, if the width of the falling flow of the raw material falling from the charging chute 3 is about 50 mm and the depth is twice as large as the falling flow width, the collision energy when the raw material falls can be reduced and the bulk density can be reduced. It is suggested that Also, by projecting the flat plate 7 into the region where the raw material rolls on the slope (case 4), the rolling speed toward the pallet bottom is reduced, the collision energy is reduced, and the raw material deposited on the flat plate 7 is further reduced. The angle of repose was reduced, and the avalanche of the raw material on the slope was prevented, and consolidation due to this was reduced (FIG. 4). The protruding length of the flat plate 7 needs to be a length that allows the raw material to smoothly flow to the bottom of the pallet, and in most cases, about 50 mm is appropriate. Also, based on Table 3 showing operation results, case 5
It was also found that by providing the flat plates 7 in multiple stages as described above, it is possible to further reduce the impact energy at the time of falling and to further suppress the consolidation of the lower layer due to the load on the upper layer, and to increase the effect of reducing the bulk density.

[0015]

As described above, by using the bulk density adjusting device according to the present invention, it is easy to reduce the bulk density of the sintering raw material layer, and the permeability of the sintering raw material layer is greatly reduced. Can be improved. By operating in such a state, the productivity was improved without significantly deteriorating the quality of the sinter.

Further, energy efficiency is improved by reducing secondary coke intensity and electric power intensity, etc.
In addition, the amount of expensive quick lime conventionally used for improving air permeability was reduced. In addition, the present invention also has the advantage of simply adding a simple device to the ore feeding section of an existing sintering machine,
This greatly contributes to the efficiency of sinter production.

[Brief description of the drawings]

FIG. 1 is a perspective view of an apparatus for adjusting a bulk density of a sintering raw material layer according to the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a diagram illustrating compaction of a sintering raw material layer.

FIG. 4 is a diagram showing the effect of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surge hopper 2 Drum feeder 3 Sloping chute 4 Sintering raw material (raw material) 5 Sintering raw material layer 5 'Slope 6 Support for vertical moving means 7 Flat plate 8 Flat support rod 9 Moving means in pallet advancing direction DESCRIPTION OF SYMBOLS 10 Vertical movement means 11 Guide shaft of vertical movement means 12 Beam

Claims (1)

[Claims] 1. A drum feeder for cutting a sintering raw material,
A sintering material charging apparatus comprising: a charging chute for distributing and depositing the cut sintering material on a pallet; A flat plate movable vertically and / or movable back and forth in the pallet advancing direction horizontally at a position corresponding to the inside of the layer.