KR100384634B1 - A method for loading bed ores on pallets in sintering machine - Google Patents

Abstract

The present invention is to change the charging distribution in the layer thickness direction of the upper light (3) to be extracted to the bottom of the trolley (2) of the sintering machine, for example, in the case of extracting in three layers at least 15-20mm, The intermediate layer 3b is at least 8-14 mm, and the uppermost layer 3c is extracted with the upper light having a size of 8 mm or less, and 8 mm or less in the uppermost layer of 0.1 to 0.15 times the width of the sintering cart from both sides of the sintering cart. This method is to extract the upper light of the layer thicker than after the middle layer of the top layer. According to this method of extracting the upper light, the sintering productivity is improved by making the flow velocity of the air flowing out to the lower part of the sintering bogie uniform. The technical gist of the method of extracting the upper light of the sintering machine, which increases not only the amount of the upper light but also is greatly reduced.

Description

Extraction of upper light of sintering machine {A METHOD FOR LOADING BED ORES ON PALLETS IN SINTERING MACHINE}

The present invention relates to a sintering operation, and more particularly to a method for extracting the upper light in the sintering operation.

The sintered ore, a blast furnace feedstock, is produced by sintering iron ore, limestone, serpentine and other raw materials, as well as a blended raw material of coke and semi-ore. That is, in the production of sintered ore, the compounding material 1 is charged onto the sintering cart 2 from the compounding material supply tank 5 in the sintering machine 10 as shown in FIG. After sintering the sintered layer by the ignition furnace 4 located in the sintering layer, the air is sucked through the air phase located in the lower part of the sintered layer, thereby sintering the particles.

In general, the trolley 2 used in the sintering operation has a plurality of grate bars formed at regular intervals of about 6 to 7 mm to allow air to be sucked downward. Therefore, when extracting the blended raw material into the sintered trolley, the upper light 3 is removed from the upper light supply tank 6 before the blended raw material is extracted on the sintered trolley so that the blended raw material does not flow down.

The upper light serves to facilitate separation from the sintered ore when distributing the sintered ore in addition to preventing the blended material from flowing out under the sintered truck. Usually, the sintered ore has a size of about 5 to 50 mm, but the blended raw material has an average particle size of about 2.0 to 2.6 mm, so that the upper light has a larger particle size than the gap between the great bars of the sintered cart.

The top light continues to recycle about 7 to 15 mm of sintered ore generated in additional processes such as crushing when the sintered ore is manufactured. Since the amount is about 11.5 to 16.2% of the amount of light distribution of the sintered ore, it is preferable to recycle it as much as possible until the operation situation allows.

On the other hand, in the conventional sintering operation, when the upper light is extracted to the sintering cart, as shown in FIG. However, the rate at which air is sucked into the lower part of the sintered bogie is faster at both sides than the central part of the sintered bogie, so that when the raw material is extracted in the extracted upper light layer, the edge of the raw material is unstable. there is a problem. To prevent this, thickening the upper light layer thickness extracted from the sintered trolley in the range of about 50 to 60 mm in the range of about 80 to 100 mm has some effect, but the increase in the layer thickness of the upper light will decrease productivity. In addition to this, there is a problem that the particle size of the sintered ore produced is lowered and the strength is lowered.

Therefore, the present invention has been proposed to solve the problems according to the conventional upper light extraction method, the object of which is the flow rate of the air exiting the lower part of the sinter bogie by varying the charge distribution in the thickness direction of the top light layer of the sinter bogie It is to increase the sintering productivity through the stable sintering operation to uniformly reduce the amount of use of the upper light.

1 is a partial configuration of a typical sintering machine

2 is a front view of the sintered trolley from which the upper light is extracted according to the conventional method;

3 is a front view of the sintered trolley from which the upper light is extracted according to the present method;

4 is a partial configuration diagram of a sintering machine in accordance with the present invention

5 is a perspective view of an extraction gate of upper light conforming to the extraction method of the present invention;

Explanation of symbols on the main parts of the drawings

1 ....... Blended raw materials 2 ..... Sintered trolley

3 ....... upper light 4 ..... ignition furnace

5 ....... Mixing material supply tank 6 ..... Upper light supply tank

10 ...... Sinterer 30, 40 .. Gate

The present invention for achieving the above object in the method for extracting the upper light on the sintering cart of the sintering machine,

When dividing the layer into which the upper light is extracted into a plurality of layers, at least the upper light having particles thicker than the interval of the great bars is extracted in the lowermost layer so as not to escape between the great bars of the sintered trolley, In the top light extraction method of the sintering machine which extracts with upper light and extracts thicker than the center part of the uppermost layer with the same upper light as the uppermost layer at the top layer which is 0.1-0.15 times the width of the sintering trolley | bogie from both sides of the said sintering trolley | bogie. It is about.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The present invention is characterized by extracting the upper light to a plurality of layers having different particle sizes from each other. 3 shows an example of a state in which the upper light is extracted on the sintered trolley according to the present method.

As shown in Fig. 3, the method for extracting the upper light of the present invention first extracts the upper light having particles thicker than the spacing of the great bars of the sintering cart 2 in the lower layer 3a, and then the upper light of the particles that become thinner toward the upper layer. Extracted by Of course, the upper light extracted to the lowermost layer should use particles thicker than the spacing of the great bars so as not to escape between the great bars of the sintered trolley.

In addition, since there are severe leaks at both sides of the sintered trolley, i.e., from both ends of the sintered trolley to 0.1 to 0.15 times the width, in the case of the present invention, both sides of the sintered trolley are composed of upper light composed of particles smaller than the existing top light. It is necessary to include. Preferably, the uppermost layer 3c at the position A, which is 0.1 to 0.15 times the width of the sintered trolley, is thicker than the central portion of the uppermost layer with at least the same upper light as the uppermost layer.

For example, as shown in FIG. 3, when the upper light is extracted in three layers, at least 15 to 20 mm in the lower layer 3a, at least 8 to 14 mm in the center 3b of the intermediate layer, and at most 8 mm in the upper layer 3c. The upper layer is composed of the upper light, and the uppermost layer of 8 mm or less of the upper layer is thicker than the center layer of the uppermost layer on the uppermost layer at the position A, which is 0.1 to 0.15 times the width of the sintered trolley from both sides of the sintered trolley. The lowermost layer should have a particle size larger than the gap of the great bar, and if the particle size exceeds 20 mm, the quality of the sintered ore decreases, so it is preferable to limit it to 15 to 20 mm. When the top layer has a particle size larger than 8 mm, a leak prevention effect is inferior, and it is preferable to limit it to 8 mm or less. In addition, the intermediate layer is preferably limited to the intermediate particle size of the lowermost layer and the uppermost layer. At this time, if the portion (A) is 0.1 to 0.15 times the width of the sintered trolley from both sides of the sintered trolley to press the more effective in preventing leakage.

In the present invention, in the case of the uppermost layer, the blast furnace semi-glossy obtained from the blast furnace may be used instead of the semi-reflective mirrors obtained from the sintering machine. That is, the blast furnace semi-reflected light is less than about 5mm, it was not possible to use in the conventional method, but in the present invention, the top layer of the upper light is extracted from the upper light having a particle size of 8mm or less, so that the blast furnace semi-reflected light can be effectively used. Therefore, there is an advantage that can greatly reduce the amount of use of the upper light itself.

Figure 4 shows a part of the structure of the sintering machine equipped with the upper light supply tank for implementing the upper light extraction method according to the present invention.

In order to extract the upper light layer according to the present invention, as shown in Figure 4 to provide the upper light supply tank (6a) (6b) (6c) having a different particle size by the desired number of layers to extract the compounding raw material from the compounding raw material supply tank (5) Before, open the gate 30a attached to the lower part in the supply tank 6a, and extract the upper light which has the thickest particle first, and remove | eliminate the particle which is thinner than the lowest layer from the other supply tank 6b on it, and in turn supply tank Top light having fine particles from 6c is supplied.

Fig. 5A is a perspective view of the extraction gate 30 of the upper light conforming to the extraction method of the present invention, and Fig. 5B is a perspective view of the extraction gate 40 apparatus having the pressing function.

As shown in Figure 5a, the gate 30 of the present invention is attached to the lower end of the upper light through the support 33 to adjust the height of the gate body 32 by the vertical operation of the cylinder 31 to facilitate the thickness of the upper light. I can regulate it. 5B shows an example of a gate 40 configured to press rolls 44 on both sides of the rear side of the gate body 42 to press both sides of the bogie. Of course, the gate of the present invention can extract the upper light in various forms in addition to this structure.

Hereinafter, the present invention will be described in detail through examples.

EXAMPLE

About 60 mm of top light having a particle size distribution as shown in Table 1 was placed on the sintering trolley of a sintering machine having an image area of 400 Nm 2, and then the blended raw materials were extracted thereon to carry out sintering operation. At this time, in the case of the conventional method, although the upper light of about 7 ~ 15mm is uniformly extracted to the bottom of the sintered trolley, in the case of the present invention, the upper light having a particle size of 15 ~ 20mm from 15 to 20mm from the bottom surface of the trolley, From the top, the upper light having a particle size of 8-14mm and the blast furnace semi-glossy having a size of 8mm or less were extracted from 15 ~ 20mm, and the blast furnace was less than 8mm at 400mm where 0.1 times from both sides of the sinter truck. Extracted to a thickness of 30 ~ 40mm.

Particle size (mm) 20 ~ + 15 15 ~ + 10 10 ~ + 5 5 ~ + 3 3 ~ 1 -One Share(%) 7.6 ~ 8.8 32.1 to 34.1 37.7 ~ 39.7 15-16 0.8 ~ 1 0.3 ~ 0.5

In these operating conditions, the productivity of the sintered ore and the total amount of the top light were investigated.

As a result, in the conventional method, the productivity was about 32.0 to 3.33 tons / day / m 3, and about 11.5 to 16.2% of the upper light was used. On the other hand, in the case of the present invention, the leakage of air from both sides of the sintered trolley was prevented and the productivity was about 32.8 to 33.1 ton / day / m 3, and the total amount of the upper light was reduced to 7.6 to 10.8% due to the use of blast furnace semi-glossy.

As described above, according to the present invention, the sintering productivity is increased through the stable sintering operation by uniformizing the flow velocity of air flowing out to the lower part of the sintering bogie by varying the charge distribution in the thickness direction of the upper light layer of the sintering bogie. It can be used to greatly reduce the amount of use of the entire upper light.

Claims (4)

In the method of extracting the upper light on the sintering cart of the sintering machine, When dividing the layer into which the upper light is extracted into a plurality of layers, at least the upper light having particles thicker than the interval of the great bars is extracted in the lowermost layer so as not to escape between the great bars of the sintering cart. The light is gradually extracted from the upper light of the particles, and from the both sides of the sintered trolley, the uppermost layer at a position 0.1 to 0.15 times the width of the sintered trolley is extracted at least as thick as the top of the top layer with the same upper light as the topmost layer. Extraction of Top Light of Sintering Machine According to claim 1, wherein the upper light is extracted from the three layers of the lowest layer is at least 15 ~ 20mm, the middle layer is at least 8 ~ 14mm, the uppermost layer has a size of 8mm or less, both sides of the sintering cart Extraction method characterized in that the uppermost layer of less than 8mm is extracted thicker than after the middle layer of the uppermost layer in the top layer of 0.1 ~ 0.15 times the width of the sintered trolley from The extraction method according to claim 1, wherein the uppermost layer uses blast furnace semi-glossy. 2. The extraction method according to claim 1, wherein a portion that is 0.1 to 0.15 times the width of the sintered trolley is pressed from both sides of the sintered trolley.