JPH0638032B2 - Air permeability adjusting device for sintering raw material layer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for adjusting the air permeability of a sintering raw material layer used when a sintering raw material is loaded on a pallet in a DL sintering machine.

(Prior Art) In a sintering ore manufacturing process in a DL type sintering machine, when charging a sintering raw material from a ore feeder to a pallet, the upper layer has a larger amount of fuel (coke) than the lower layer and has a lower layer. It is well known that it is more effective to improve the quality and yield of the sintered ore by charging the part so that the grain size of the raw material is coarser than that of the upper part.

Further, the lower layer portion of the sintering raw material layer charged on the pallet has a larger drop at the time of charging than the upper layer portion, and the load density increases due to the load of the upper layer portion, which significantly deteriorates the air permeability. .
Therefore, improving the air permeability of the sintering raw material layer, especially the air permeability of the lower layer portion, and reducing the difference in air permeability between the upper layer portion and the lower layer portion,
It is well known that it is effective in improving the productivity, quality and yield of sinter.

Japanese Unexamined Patent Publication (Kokai) No. 57-164940 proposes a sintering raw material charging device that segregates the raw material particle size and the fuel component in the vertical direction of the sintering raw material layer. As shown in FIG. 7, the sintering raw material 9 supplied from the drum feeder 2 is classified by appropriately selecting the slit width of the slit-shaped opening 6,
There is a difference in particle size between the raw material 9b dropped from the slit-shaped opening 6 and the raw material 9a that has not fallen. Further, the slit-shaped opening 6 causes the raw material to fall into two parts, that is, the falling raw material 9b and the unfalling raw material 9a.
Since it is divided into two, the chute load of the chute 7 at the lower end of the opening integral with the chute 5 and the chute 8 immediately below the opening, that is, the raw material supply speed per 1 m of pallet (T / H /
m) is lowered, and the raw material lower layer portion 10L formed by the unfalled raw material 9a sliding down on the chute 7 and the raw material upper layer portion 10U formed by the falling raw material 9b sliding down on the chute 8 are both expanded in particle size segregation. As a result, the particle size segregation is enlarged as a whole. Therefore, it is possible to cause a large grain size segregation in the layer height direction of the sintering raw material layer and to increase the coke concentration in the upper layer portion, and particularly to improve the yield of the sintered ore in the upper layer portion. .

(Problems to be Solved by the Invention) In this apparatus, since the raw material 9b forming the raw material upper layer portion 10U is reduced in drop energy when falling from the slit-shaped openings 6, the air permeability of the upper layer portion 10U is reduced. Is higher than the upper portion of the raw material layer formed by the conventional charging device shown in FIG. Therefore, the difference in air permeability between the upper layer portion 10U and the lower layer portion 10L is increased.

Further, when the conventional charging device shown in FIG. 8 is modified to the charging device described above, since the hopper 1 and the drum feeder 2 need to be raised, the head drop at the time of charging increases and the raw material layer Of the sinter ore, especially the air permeability of the lower layer part is deteriorated, and it is difficult to improve the productivity and quality of the sinter ore and the yield of the sinter ore of the lower layer part.

Further, conventionally, in order to reduce the charging density of the lower layer part of the sintering raw material layer and improve the air permeability, the device shown in FIG.
No. 98506) is used. That is, the sintering raw material 9 supplied by the drum feeder 2 is loaded on the pallet 3 via the chute 5. At that time, sintering raw material 9
Is once collided with the skid rod 12 to reduce the speed, thereby preventing an increase in the charging density of the lower layer portion of the raw material layer 10.

The present inventors investigated the detailed influence on the air permeability using the apparatus shown in FIG. As a result, when the skid rod 12 is installed above the surface layer of the raw material layer or above the surface of the raw material layer, and when the entire amount of the sintering raw material 9 falling from the chute 5 collides with the skid rod 12, the entire raw material layer 10 Although the air permeability is improved, it is impossible to improve only the air permeability of the lower layer portion. Further, when the skid rod 12 is transferred from the surface layer portion of the raw material layer to the lower layer portion, the amount of the sintering raw material 9 which directly collides with the skid rod 12 from above the chute 5 is remarkably reduced, so that the air permeability is almost improved. It turns out that it does not. Therefore, with this conventional method, it is difficult to improve only the air permeability of the lower layer portion of the raw material layer and reduce the difference in air permeability between the upper layer portion and the lower layer portion.

The present invention solves the above-mentioned problems of the prior art and improves the air permeability of the lower layer portion of the raw material layer formed by a sintering raw material charging device having a slit-shaped opening to improve the air permeability of the upper layer portion and the lower layer portion. It is an object of the present invention to provide a device capable of reducing the difference between

(Means for Solving Problems) The gist of the present invention is to provide a sintering raw material in which a plurality of slit-shaped openings are formed in a raw material sliding part of a chute for receiving the sintering raw material dropped and supplied from a hopper through a drum feeder. In the charging device, a skid consisting of a plurality of rod-shaped bodies arranged in parallel to the pallet advancing direction is provided at the dropping portion on the pallet of the raw material to be loaded onto the pallet from the tip end without dropping from the slit-shaped opening. An apparatus for adjusting the air permeability of a sintering raw material layer is characterized in that bars are provided in a plurality of stages, and the vertical bars of each stage can be vertically moved and moved back and forth in a pallet advancing direction.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a partial cross section of a sintering raw material charging device. As shown in the figure, this charging device is configured to charge a sintering raw material in which a plurality of slit-shaped openings 6 are formed in a raw material sliding portion of a chute for receiving the sintering raw material dropped and supplied from a hopper 1 through a drum feeder 2. In the apparatus, a skid formed of a plurality of rod-shaped bodies arranged in parallel to the pallet traveling direction is provided at a dropping portion on the pallet of the raw material charged into the pallet 3 from the tip portion without dropping from the slit-shaped opening 6. It is characterized in that the rods 12 are provided in a plurality of stages, and the vertical rods 12 of each stage can be moved up and down and moved back and forth in the pallet advancing direction.

That is, in order to improve the air permeability of only the lower layer portion 10L of the raw material charged in the pallet 3, it is necessary to adjust the position of the tip of the above-mentioned skid rod 12 so that only the unfallen raw material 9a collides with the skid rod 12. At the same time, the height h from the upper end of the grade bar 11 of the ski rod 12 is adjusted so that almost all the unfallen raw material 9a collides with the ski rod 12,
It is necessary to prevent 2 from being buried in the layer of the raw material lower layer portion 10L. Further, the dropping position of the unfallen raw material 9a on the pallet 3 and the height of the raw material lower layer portion 10L change depending on the angle of the chutes 5 and 7 integrated with the slit-shaped opening 6 or the slit width of the slit-shaped opening 6. Therefore, it is necessary to adjust the front-back and up-down positions of the ski rod 12.

The back-and-forth moving mechanism of the skid rod 12 installs wheels 14 on both side surfaces of the machine body 13 and disposes rails 15 near both side surfaces of the machine body 13 to move the machine body 13 as a whole back and forth.

2 and 3 are a front view and a plan view illustrating the squeeze rod 12 and a mechanism for moving the squib. As shown in the figure, the vertical movement mechanism of the ski rod 12 rotates the screw shaft 21 via the gear 20 by the handle 17 to move the nut 2
The skid rod mounting frame 23 having 2 is moved up and down along the slide guide 24 by the nut 22 that is screwed in and out as the screw shaft 21 rotates. In the figure, 18 is a speed reducer, 19
Is the shaft.

As shown in FIG. 4, the holes 16 of the mounting frame 23 are arranged in upper and lower two stages. By mounting as shown in FIG. 4 (c), etc., the degree of collision of the raw material with the squeeze rod can be changed to adjust the air permeability of the lower layer of the raw material layer, which is optimum for the sintering operation. In addition, the holes 16 of the mounting frame 23 are provided on the upper and lower sides 2 as described above.
The number of stages is not limited, and one or three stages may be used. Further, as the shape of the skip rod 12, a flat plate shape or a rhombus shape is also effective in addition to the round shape shown in FIG. If the gap 1 between the adjacent ski rods 12 is too narrow, the raw material colliding with the ski rods 12 will not fall from the gap. That is, since the raw material causes hanging, the gap 1 must be set to a certain value or more. The minimum value of the gap may be set to about 20 mm, though it varies slightly depending on the shape, size, and arrangement of the rods 12.

Further, it is not necessary to install the skid bar 12 in the entire width direction of the pallet 3. For example, if the skid bar 12 is not installed in the vicinity of the side portion having relatively good air permeability, the air permeability in the pallet width direction is adjusted. It is also possible.

Next, the operation of this embodiment will be described. The sintering raw material 9 in the hopper 1 is discharged from the chute 5 by the drum feeder 2.
It is dropped and supplied upward, and is classified by the slit-shaped opening 6. The raw material 9b dropped from the slit-shaped opening 6 slides down on the chute 8 and is charged onto the pallet 3 to form the raw material upper layer portion 10U. The raw material 9a that does not fall in the slit-shaped opening 6 slides down on the chute 7, collides with the skid rod 12 to reduce the falling energy, and then is charged onto the pallet 3 to form the raw material lower layer portion 10L.

At this time, in order to change the grain size segregation state of the raw material layer 10 in the layer height direction, the chute 5, which is integral with the slit-shaped opening 6, is formed.
When the angle of No. 7 is changed, the height of the raw material lower layer portion 10L is changed because the amount of the raw material 9b falling from the slit-like opening is changed while the drop position of the unfallen raw material 9a is changed. . Therefore, while changing the longitudinal position of the ski rod 12, the screw shaft 21 is rotated by the handle 17 via the gear 20, and the ski rod mounting frame 23 having the nut 22 is screwed in and out with the rotation of the screw shaft 21. Slide guide 24 with nut 22
Up and down along.

A construction example of this embodiment will be described below.

Pallet width with loading device having slit-shaped opening
The air permeability adjusting device for the sintering raw material layer of the present invention was installed in a 3.5 m DL type sintering machine, and the sintering raw material was charged to produce a sintered ore. As the conditions at this time, there are two levels, that is, the conventional method in which no skid rod is installed and the example in which the skid rod is installed. The shape, size, arrangement, gap width, position and height of the raw material layer of the skid rod are summarized in Table 1. Showed.

Further, the sintering conditions at this time were constant as shown in Table 2.

FIG. 5 shows the distribution of the air permeability index JPU of the raw material layer in the height direction of the raw material layer, which is determined by the following equation (1) from the suction wind speed measured for the raw material layer before ignition and the static pressure distribution in the raw material layer.

If the material layer has good air permeability, the value of JPU will increase,
According to the present invention, the air permeability of only the lower layer portion of the raw material layer is improved and the difference in air permeability between the upper layer portion and the lower layer portion is reduced as compared with the conventional method.

As a result, as shown in FIG. 6, in the present invention, the suction pressure of the blower was reduced by about 200 mmAq and the sinter yield was improved by about 1.0% as compared with the conventional method.

(Effects of the Invention) According to the present invention, it is possible to improve the air permeability only in the lower layer portion of the raw material layer, which has been difficult in the past, and reduce the difference in air permeability between the upper layer portion and the lower layer portion. It is possible to improve productivity by improving productivity and improve yield and quality by uniform baking.

[Brief description of drawings]

1 to 4 show one embodiment of the present invention. FIG. 1 is a side view of the entire raw material charging device, FIG. 2 is a front view of a mechanism for moving a skid rod, and FIG. Plan view of the figure, Figure 4 (a) ~ (c)
Is a front view showing various aspects of attachment of a ski rod, FIG. 5 is a drawing comparing JPUs in a raw material layer, FIG. 6 is a drawing comparing blower suction pressure and sinter yield, and FIGS. FIG. 7 is a conventional example, FIG. 7 is a side view of a raw material charging device having a slit-shaped opening, FIG. 8 is a side view of a normal raw material charging device, and FIG. 9 is a perspective view of a breathability adjusting device. is there. 1 ... Hopper, 2 ... Drum feeder, 3 ... Pallet, 5 ... Chute, 6 ... Slit-like opening, 7 ...
Chute, 8 ... Chute, 9 ... Sintering raw material, 9a ...
Unfalling raw material, 9b ... Falling raw material, 10 ... Raw material layer, 10
L ... Raw material layer lower layer portion, 10U ... Raw material layer upper layer portion, 11 ...
… Grade bar, 12 …… Ski stick, 13 …… Aircraft, 14
…… Wheels, 15 …… Rail, 16 …… Ski rod mounting holes,
17 ... Handle, 18 ... Reducer, 19 ... Shaft, 20 ... Gear, 21 ... Shaft, 22 ... Nut, 23 ... Skip rod mounting frame, 24 ... Slide guide,
h …… Height of skis, l …… Gap between skis

Claims (1)

[Claims] 1. An apparatus for charging a sintering raw material, wherein a plurality of slit-shaped openings are formed in a raw material slide portion of a chute for receiving the sintering raw material dropped and supplied from a hopper through a drum feeder. In the falling part of the pallet where the raw materials are loaded into the pallet from the front end without being installed, a plurality of squeeze bars made of a plurality of rods arranged parallel to the pallet advancing direction are provided. An apparatus for adjusting the air permeability of a sintering raw material layer, characterized in that the rod can be moved up and down and back and forth in the pallet advancing direction.