JP4783871B2 - Cooling device for reduced iron agglomerates - Google Patents

Description

The present invention is oxidized at facility for producing reduced TetsukatamariNaru product from TetsukatamariNaru product, relates equipment for cooling the high temperature reducing TetsukatamariNaru product which is continuously discharged are reduced in the reducing furnace is there.

  As a cooling method for reduced iron agglomerates discharged from reduced iron production facilities, conventionally, after reducing iron agglomerates are submerged and cooled in a water tank, they are pulled up from the water tank by a conveyor and directly discharged between the soil to pile up. After being stored, a method of carrying it appropriately and putting it into an electric furnace has been put into practice.

  However, the reduced iron agglomerate obtained by this submerged cooling method has a high moisture content, and if it is directly put into the molten metal, there is a risk of causing a steam explosion, so it is limited to the electric furnace. In addition, there has been a problem that the reduced iron agglomerates are powdered and the metalization rate is lowered.

Also, the reduced iron obtained by direct reduction ironmaking processes molded by briquette machine equipment, slow cooling at 0.99 ° C. / minute to 250 DEG ° C. / min cooling rate at the spray water reduced iron briquettes in this state reduction An iron briquette manufacturing method is disclosed (for example, refer to Patent Document 1 and Claim 1) .

  However, this method is a method of slow cooling by spray cooling to suppress cracking of high temperature reduced iron briquettes, and is a method of cooling reduced iron agglomerates discharged from reduced iron production facilities such as rotary hearth furnaces. In addition, the proper moisture content of the reduced iron agglomerates is not considered.

In addition, the high-temperature reduced iron briquettes after pressurized thermal reduction, a method of water cooling to be between the average cooling rate to 1500 ° C. / min to 500 ° C. / min while the surface temperature is lowered to 0.99 ° C. from 650 ° C. (For example, refer to Patent Document 2 and Claim 1) .

  However, this method relates to cooling of reduced iron pellets, and is different in size and property from the agglomerates such as briquettes targeted by the present invention, and this method cannot be applied as it is. The temperature of the reduced iron agglomerate discharged from the rotary hearth furnace is about 1000 ° C., but there is no description about the cooling method and cooling rate up to 650 ° C. There is no description of the cooling means, and no attention is paid to the water content of the agglomerated material.

Japanese Patent No. 314583 Japanese Patent No. 3009661

The present invention solves the problems of conventional techniques as described above, it you are an object to provide a cooling apparatus you a proper range center temperature and moisture content of the reducing TetsukatamariNaru product.

The gist of the present invention for solving the above problems is as follows.
An apparatus for cooling the reducing TetsukatamariNaru product discharging the acid KatetsukatamariNaru compound as a reducing reduced TetsukatamariNaru product in the reduction furnace, conveying the hot reducing TetsukatamariNaru product to the outlet of the reduced iron production facility a conveyor disposed to place a plurality of spray nozzles above the conveyor, there in apparatus for intermittently cool the reduced TetsukatamariNaru product on the conveyor by ejecting intermittently spraying water from the spray nozzles The spray nozzles are arranged so that the spread width B of the spray nozzles and the transport direction nozzle pitch P are expressed by the following formula (1):
B ≦ P (1)
The spray nozzle has a relationship between the spread width B of the spray water in the transport direction and the spread width W of the conveyor width in the range of the following formula (3):
W ≧ 2 × B (2)
The reduced iron agglomerated cooling apparatus according to claim 3, wherein the relationship between the width W of the spray water in the conveyor width direction and the conveyor width CW is in the range of the following formula (3) .
CW ≦ W (3)

As described above, according to this onset illumination device, it can be made proper range center temperature and moisture content of the reducing TetsukatamariNaru product. Cooling device High-temperature reduced iron agglomerates can be efficiently cooled, and reoxidation by the atmosphere can be suppressed. In addition, the water content of the cooled reduced iron agglomerates can be adjusted to a low level, the risk of steam explosion at the time of charging into the molten metal is eliminated, and the energy required for melting can be minimized.

It is explanatory drawing which shows the example of this invention. It is an AA arrow top view of FIG. 1 which shows the example of this invention. It is an example of the spray watering in this invention, Comprising: It is CC arrow expanded sectional view of FIG. FIG. 3 is a front view of the example of the present invention as viewed in the direction of arrows BB in FIG. 2. It is explanatory drawing which shows the cooling capacity in the example of FIG. It is explanatory drawing which shows the example of arrangement | positioning of the conventional spray nozzle. It is explanatory drawing which shows another example of arrangement | positioning of the conventional spray nozzle.

The apparatus of the present invention will be described with reference to the example of FIG. The iron oxide agglomerate is reduced in a rotary hearth furnace 13 as a reduction furnace and continuously discharged from the reduced iron agglomerate discharge port 8. The discharged reduced iron agglomerated material 5 is cooled on the conveyor 6 in the cooling device 16 connected to the discharge port 8 and cooled by water sprayed from the plurality of spray nozzles 1 to be reduced iron agglomerated. It is discharged from the chemical discharge port 7 and conveyed to a storage device (not shown).

Each spray nozzle 1 is attached to the nozzle header 2 provided above the conveyor 6 in parallel with the conveying direction of the conveyor 6 at a predetermined interval. The spray nozzle 1, the spray header 2, and the conveyor 6 are covered with a casing 15, and a reduced iron agglomerate discharge port 7 for discharging the cooled reduced iron agglomerate 5 is provided at the front end side of the casing 15. Provided on the rear end side is a sludge discharge port 9 for discharging sludge generated by watering the reduced iron agglomerate 5.

FIG. 2 shows an example of the AA arrow plane of FIG. 1 on the conveyor 6, and the pitch P of the spray nozzles 1 is arranged to be P = B, and the spray water from each spray nozzle 1 is sprayed. As shown by the range 1a, water is sprinkled with a width B spread in the conveying direction. With this arrangement, the spread widths B of the adjacent nozzles 1 in the transport direction of the spray water do not overlap.

FIG. 3 is an enlarged cross-sectional view taken along the line CC in FIG. 2. Each spray nozzle 1 is attached to the spray header 2 with a spacing P in the transport direction, and spray water is sprayed on the conveyor 6 with a width B spread in the transport direction. The

4 shows a front view taken along the line B-B in FIG. 2, the spray nozzle 1 is provided on the spray header 2 disposed at the center in the width direction of the conveyor 6, and the spray water is not less than the width CW of the conveyor 6 on the conveyor 6. Water is sprayed with a width W of the width direction. Water is supplied to the spray header 2 from a water supply pipe 3 as illustrated in FIG.

In general, a conical spray nozzle is used as the cooling nozzle as shown in FIGS. 6 and 7, and the spread of spray water ejected from the cooling nozzle across the width direction and the conveying direction of the reduced iron agglomerates interferes with each other. The spray water is sprayed to all the reduced iron agglomerates as much as possible.

Further, when the conical spray nozzles as shown in FIGS. 6 and 7 are used, the spray ranges 1b and 1c of each nozzle are overlapped, the cooling state varies in the conveyor width direction, and the temperature and moisture of the agglomerate vary. Occurs.

In the present invention, the spread width B of the spray water in the transport direction and the transport direction pitch P of the spray nozzle are set to B ≦ P. This condition enables uniform cooling by determining the pitch of the spray nozzles so that the spread widths B ejected from the spray nozzle 1 do not overlap each other.

Further, in the present invention, the relationship between the width W of the spray water in the conveyor width direction and the width B in the conveyance direction is set to 2B ≦ W. This condition is that the spray range 1a is flat as shown in FIG. 2. For example, by adopting a flat spray nozzle, the spread width B of the spray water in the transport direction is substantially constant in the conveyor width direction. The variation in the cooling state is small, and intermittent cooling can be performed effectively.

Furthermore, in the present invention, the relationship between the spread width W of the spray water in the conveyor width direction and the conveyor width CW is in the range of CW ≦ W, that is, the relationship between W and CW is as shown in FIG. 5 is obtained, and the reduced iron agglomerated material on the conveyor 6 is uniformly cooled in the conveyor width direction.

1: Spray nozzle 1a: Spray range by flat spray nozzle 1b: Spray range by conical spray nozzle 2: Nozzle header
3: Supply water piping 4: Steam exhaust port 5: Reduced iron agglomerate 6: Conveyor 7, 8: Reduced iron agglomerate discharge port 9, 10: Sludge discharge port 11: Sludge tank 12: Sludge conveyor 13: Rotary hearth Furnace 14: Sludge recovery tank 15: Casing 16: Cooling device

Claims (1)

In an apparatus for cooling reduced iron agglomerates that are reduced in a reduction furnace and discharged as reduced iron agglomerates,
A conveyor for transporting high-temperature reduced iron agglomerates is disposed at the discharge port of the reduced iron production facility, a plurality of spray nozzles are disposed above the conveyor, and spray water is intermittently ejected from the spray nozzles. A device that intermittently cools the reduced iron agglomerate on the conveyor,
The spray nozzles are arranged so that the spread width B of the spray nozzle and the transport direction nozzle pitch P are expressed by the following formula (1):
B ≦ P (1)
In the spray nozzle, the relationship between the spreading width B in the transport direction of the spray water and the spreading width W in the conveyor width direction is within the range of the following formula (2).
W ≧ 2 × B (2)
And the cooling apparatus of the reduced iron agglomerated material characterized by making the relationship of the said conveyor water width direction breadth W and the conveyor width | variety CW into the range of following (3) Formula .
CW ≦ W (3)

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