JP2021131196A - Dust exhaust mechanism in water-sealing type seal device - Google Patents

Abstract

To provide a dust exhaust mechanism capable of uniformly removing dust deposited on the inside of a water sealing type seal device and preventing the rotation failure of a hopper and the abrasive breakage of a rotary type sintered ore cooling device.SOLUTION: An exhaust mechanism is used for dust 25 deposited on the inside of a water sealing type seal device 20 provided at a rotation type sintered ore cooling device comprising a hopper 11 having a toric shape in a plan view and rotating in a horizontal face and an upper stationary food 12 stationarily arranged so as to cover the upper face of the hopper 11. The water sealing type seal device 20 comprises: an annular gutter 21 storing seal water 24 and rotating together with the hopper 11 in a horizontal face; an upper cover 22 integrated with the upper stationary hood 12 and covering the upper face of the annular gutter 21; and a partition plate 23 sagging from the upper cover 22, having a gap with the bottom part of the annular gutter 21 and immersed into the seal water 24. A suction tube 30 sucking the dust 25 deposited on the bottom part of the annular gutter 21 and a discharge nozzle 31 discharging water toward the bottom part on the side wall of the annular gutter 21 are fitted to the upper cover 22.SELECTED DRAWING: Figure 3

Description

The present invention relates to a mechanism for discharging dust accumulated inside a water-sealed sealing device provided in a rotary sinter cooling device.

The sinter to be charged into the blast furnace is produced by tempering and agglomerating the raw material iron ore powder ore, sintering it with a sinter, and then cooling it to a temperature that can be handled by a sinter cooling device. ing. The sinter discharged from the sinter generally has a sensible heat of 500 ° C. to 700 ° C., and is cooled to 100 ° C. to 150 ° C. or lower by a sinter cooling device. The amount of sensible heat that is wasted during cooling is enormous. Therefore, in the sinter cooling device, exhaust heat is recovered from the cooling air that has exchanged heat with the sinter. A rotary sinter cooling device is known as a sinter cooling device capable of recovering exhaust heat.

The rotary sinter cooling device has a hopper which is circular in a plan view and rotates in a horizontal plane with a central axis as a rotation axis, and an upper fixed hood which is fixedly arranged so as to cover the upper surface of the hopper. There is. The hot sinter discharged from the sinter is continuously charged into the hopper via a chute, and is cooled by the cooling air supplied into the hopper from the lower part of the hopper. The cooling air supplied into the hopper exchanges heat with the sintered ore in the hopper, and then is sent to a dust remover and a heat recovery boiler through the upper fixed hood to recover heat. The cooled sinter is discharged onto the belt conveyor by a scraper installed at the lower end of the hopper.

In order to prevent air from entering the rotary sinter cooling device through the gap between the hopper and the upper fixed hood, the gap is provided between the outer and inner circumferences of the rotary sinter cooling device. A water-sealing sealing device for water sealing is installed.
The water-sealed sealing device is integrated with an annular gutter that stores sealing water and rotates in a horizontal plane together with a hopper, an upper lid that covers the upper surface of the annular gutter, and a gap that hangs from the upper lid and the bottom of the annular gutter. It is equipped with a partition plate to be immersed in sealing water.

The cooling air that has exchanged heat with the sinter in the hopper contains sinter dust. This dust invades the seal water and accumulates at the bottom of the gutter. When the amount of dust accumulated on the bottom of the annular gutter is large, the rotation of the annular gutter is hindered by friction with the partition plate, resulting in poor rotation of the hopper. Further, since the dust contains calcium, when the dust accumulated at the bottom of the annular gutter overflows from the annular gutter, it gradually solidifies using the calcium component as a binder during drying to form a strong massive deposit. As a result, the rotary sinter cooling device may be worn and damaged.

Therefore, in Patent Document 1, the water-sealed water is continuously discharged from the bottom of the water-sealed tank of the water-sealing device of the annual kiln, the suspension in the water-sealed water is separated, and the water-sealed water is discharged from the water-sealed water tank. A technique for removing solid matter at the bottom of a water-sealed tank and preventing clogging by continuously repeating the process is described.

Further, in Patent Document 2, in addition to installing a sealing member having shape flexibility and a material of stainless steel on the upper part of the movable side partition plate on the passage side of the cooling gas to prevent dust from entering, dust is generated. Assuming an intrusion, a water supply pipe and a drain pipe are installed in the water seal box (annular trough), and water is supplied by the water supply pipe and drained by the drain pipe. A technique for removing dust that has been sucked and accumulated in the water-sealed box is described.

Further, in Patent Document 3, the gas injection port is submerged in the seal water while the water is discharged by the water discharge pipe that fluctuates the water level of the seal water of the water sealing device provided at the coke inlet of the coke dry fire extinguishing facility up and down. , A technique of injecting gas in the direction of the drainage port provided in the annular gutter and in the direction of the dust to disintegrate the dust and discharge the collapsed dust from the drainage port is described.

Japanese Unexamined Patent Publication No. 53-96543 Japanese Unexamined Patent Publication No. 2015-197228 Japanese Unexamined Patent Publication No. 2013-181098

In the present inventors, the dust that has entered the water-sealed sealing device adheres to the inner peripheral surface side of the partition plate and the side wall surface of the annular gutter facing the partition plate and grows, and at the same time, a part thereof becomes a lump and is annular. It was discovered that by falling and accumulating on the bottom of the gutter, it promotes the blockage of the annular gutter.
Hereinafter, in the present specification, the side facing the central axis of the rotary sinter cooling device is referred to as an inner peripheral surface side, and the opposite side thereof is referred to as an outer peripheral surface side.

Patent Document 1 describes that the solid matter at the bottom of the water-sealed tank is discharged together with the water-sealed water by a suction pipe, but the water supply to the water-sealed tank by an overflow pipe or the like keeps the water level in the water-sealed tank constant. The purpose is to keep the temperature at, and it is not possible to suppress the adhesion of dust to the inner peripheral surface side of the partition plate and the side wall surface of the annular gutter facing the inner peripheral surface side.

Patent Document 2 describes that the dust that has entered the water-sealed box is sucked and removed by a drain pipe, but the dust that has accumulated other than directly under the drain pipe is difficult to be sucked, and the dust that has accumulated in the form described above is difficult to be sucked. Cannot be removed by inhalation. Further, as in Patent Document 1, the water supply from the water supply pipe is intended to keep the water level in the water sealing box constant, and the inner peripheral surface side of the partition plate and the side of the annular gutter facing the inner peripheral surface side thereof. It is not possible to suppress the adhesion of dust to the wall surface.

Further, Patent Document 3 describes a technique for discharging the dust accumulated in the annular gutter from a drainage port provided in the annular gutter, but in the case of a rotary annular gutter, the drainage port cannot be provided. .. Therefore, the technique described in Patent Document 3 cannot be applied to the water-sealed sealing device.

The present invention has been made in view of such circumstances, and it is possible to evenly remove the dust accumulated inside the water-sealed sealing device to prevent the hopper from rotating poorly and the rotary sintered ore cooling device from being worn and damaged. It is an object of the present invention to provide an excellent dust discharge mechanism.

In order to achieve the above object, the present invention has a hopper which is circular in a plan view and rotates in a horizontal plane with a central axis as a rotation axis, and an upper fixed hood which is fixedly arranged so as to cover the upper surface of the hopper. It is a discharge mechanism of dust accumulated inside the water-sealed sealing device provided in the rotary sintered ore cooling device.
The water-sealed sealing device is integrated with an annular gutter that stores sealing water and rotates in a horizontal plane together with the hopper, an upper lid that is integrated with the upper fixed hood and covers the upper surface of the annular gutter, and the upper lid that hangs down from the upper lid. It is provided with a partition plate that has a gap between the bottom of the annular gutter and is immersed in the sealing water.
The upper lid includes a suction pipe that is inserted into the sealing water and sucks dust accumulated on the bottom of the annular gutter, and a discharge nozzle that is inserted into the sealing water and discharges water toward the bottom of the annular gutter. It is characterized by being attached to each of them.

In the present invention, while the annular gutter rotates in a horizontal plane, the suction pipe and the discharge nozzle fixed to the non-rotating upper lid evenly remove the dust accumulated on the bottom of the annular gutter. The dust accumulated on the bottom of the annular gutter is collected toward the suction pipe side by the water discharged from the discharge nozzle, and is sucked and removed from the suction port of the suction pipe.
The floating dust in the seal water is carried to the suction port of the suction pipe by the water flow of the seal water, and is sucked and removed from the suction port of the suction pipe. Further, the sealing water is agitated by the water discharged from the discharge nozzle, and dust adhesion and dust adhesion to the side wall surface and the partition plate of the annular gutter are suppressed.

Further, in the dust discharge mechanism in the water-sealed sealing device according to the present invention, the injection nozzle for injecting water toward the inner peripheral surface of the partition plate faces the inner peripheral surface of the partition plate of the annular gutter. It may be installed on the upper part of the side wall.
As a result, the sealing water on the inner peripheral surface side of the partition plate is agitated to prevent dust from adhering to the inner peripheral surface of the partition plate, and the dust adhering to the inner peripheral surface of the partition plate is peeled off.

Further, in the dust discharge mechanism in the water-sealed sealing device according to the present invention, a scraper that comes into contact with the bottom of the annular gutter and scrapes up the dust accumulated on the bottom may be attached to the lower end of the suction pipe. ..
As a result, the dust accumulated near the suction port of the suction pipe is scraped up by the scraper, and is surely absorbed and removed from the suction port of the suction pipe.

In the dust discharge mechanism in the water-sealed sealing device according to the present invention, while the annular gutter rotates in the horizontal plane, the suction pipe and the discharge nozzle fixed to the non-rotating upper lid evenly collect the dust accumulated on the bottom of the annular gutter. Since it is removed, it is possible to prevent the hopper from rotating poorly and the rotary sintered ore cooling device from being worn and damaged due to dust inside the water-sealed sealing device.

It is a top view of the rotary sinter cooling apparatus. FIG. 1 is an end view taken along the line AA of FIG. (A) Schematic diagram of the suction pipe and scraper constituting the dust discharge mechanism in the water-sealed seal device according to the embodiment of the present invention, (B) Discharge nozzle constituting the dust discharge mechanism in the water-sealed seal device. It is a schematic diagram of. It is a schematic diagram of the injection nozzle which constitutes the dust discharge mechanism in the water seal type sealing device.

Subsequently, an embodiment embodying the present invention will be described with reference to the attached drawings, and the present invention will be understood. In the present specification and the drawings, components having substantially the same function are designated by the same reference numerals, and duplicate description thereof will be omitted.

The plane of the rotary sinter cooling device 10 for cooling the sinter discharged from the sinter (not shown) is shown in FIG. 1, and the end face of the arrow AA is shown in FIG.
The rotary sintered ore cooling device 10 has a hopper 11 that is circular in a plan view and rotates in a horizontal plane with a central axis 13 as a rotation axis, and a non-rotating upper portion that is fixedly arranged so as to cover the upper surface of the hopper 11. It has a fixed hood 12. The time required for the hopper 11 to make one rotation is about 15 to 20 minutes.

As shown in FIG. 2, the upper fixed hood 12 has an opening on the lower surface, and water-sealed seals on both sides of the upper fixed hood 12 water-seal the gap between the hopper 11 and the upper fixed hood 12. Each device 20 is installed.

The water-sealing sealing device 20 is integrated with an annular gutter 21 that stores sealing water 24 and rotates in a horizontal plane together with a hopper 11, and an upper lid 22 that is integrated with an upper fixed hood 12 and covers the upper surface of the annular gutter 21 and hangs down from the upper lid 22. A partition plate 23 that has a gap between the bottom of the annular gutter 21 and is immersed in the sealing water 24 is provided (see FIGS. 3A and 3B). The partition plate 23 is arranged between the outer peripheral side wall 21a and the inner peripheral side wall 21b constituting the annular gutter 21, and divides the sealing water 24 into the outer peripheral wall sealing water and the inner peripheral wall sealing water. ..

Hereinafter, the dust discharge mechanism in the water-sealed sealing device according to the embodiment of the present invention will be described.
In the dust discharge mechanism in the water-sealed sealing device according to the present embodiment, the suction pipe 30 that is inserted into the sealing water 24 and sucks the dust 25 accumulated on the bottom of the annular gutter 21 and the annular gutter 21 that is inserted into the sealing water 24 and sucks the dust 25. Discharge nozzles 31 for discharging water toward the bottom of the side walls 21a and 21b are attached to the upper lid 22, respectively (see FIGS. 3A and 3B).

When the suction pipe 30 is inserted into the inner circumference seal water between the inner circumference side wall 21b and the partition plate 23, the invading dust adheres to and adheres to the suction pipe 30, and when the adhered dust grows, the hopper There is a possibility that the rotation failure of 11 may occur. Therefore, it is preferable to insert the suction pipe 30 into the outer peripheral edge seal water between the outer peripheral edge wall 21a and the partition plate 23. The suction port of the suction pipe 30 is brought close to the bottom of the annular gutter 21.
The diameter of the suction pipe 30 is not limited, but is set to 50A in the present embodiment.

In the vicinity of the suction port at the lower end of the suction pipe 30, a scraper 32 that comes into contact with the bottom of the annular gutter 21 and scrapes up the dust 25 accumulated on the bottom is attached. The scraper 32 has a wide angle with respect to the width direction of the bottom of the annular gutter 21 in order to surely scrape up the dust 25 accumulated near the suction port.

The discharge nozzle 31 is installed on the opposite side (upstream side) of the rotation direction of the annular gutter 21 with respect to the installation position of the suction pipe 30. The distance between the discharge nozzle 31 and the suction pipe 30 is about ½ of the seal water level. If the distance is too long, the dust once collected may be diffused, and if the distance is too short, the accumulated dust may be sucked by the suction pipe 30 before being collected, and the amount of dust that cannot be removed may increase.
Further, when the discharge nozzle 31 is inserted into the inner circumference seal water between the inner circumference side wall 21b and the partition plate 23, the invading dust adheres to and adheres to the discharge nozzle 31 as in the suction pipe 30. If the adhered dust grows, the hopper 11 may not rotate properly. Therefore, it is preferable to insert the discharge nozzle 31 into the outer peripheral edge seal water between the outer peripheral edge wall 21a and the partition plate 23.

A suction pipe 30 is provided near the center of the annular gutter 21 in the width direction, and water is discharged from the tip of the discharge nozzle 31 toward the bottom of the side walls 21a and 21b of the annular gutter 21. In the present embodiment, the tip of the discharge nozzle 31 is bifurcated, and the side wall 21a discharges water toward both the bottom and the side wall 21b. As a result, the dust accumulated on the annular gutter 21 is collected directly under the suction pipe 30 by the water discharged from the discharge nozzle 31. When the suction pipe 30 is provided on the side walls 21a and 21b of the annular gutter 21, the discharge nozzle 31 may be provided so that the side walls 21b and 21a on the opposite side discharge water toward the bottom of the wall.
The discharge pressure is 3 MPa or more, preferably 30 MPa or more.
The diameter of the discharge nozzle 31 is smaller than the diameter of the suction pipe 30. In this embodiment, it is set to 8A.

Further, in the dust discharge mechanism in the water-sealed sealing device according to the present embodiment, as shown in FIG. 4, the partition plate 23 is placed on the upper portion of the side wall 21b of the annular gutter 21 facing the inner peripheral surface of the partition plate 23. An injection nozzle 33 that injects water toward the inner peripheral surface of the water may be installed. The tip of the injection nozzle 33 is inserted into the sealing water 24, and high-pressure water is injected toward the inner peripheral surface of the partition plate 23. The pressure at the time of injection is 3 MPa or more, preferably 30 MPa or more.
Since the injection nozzle 33 rotates in the horizontal plane in synchronization with the annular gutter 21, it is possible to obtain the effect of peeling the dust 25 and preventing the dust 25 from adhering to the entire inner peripheral surface of the partition plate 23.
The diameter of the injection nozzle 33 is the same as the diameter of the discharge nozzle 31.

Although one embodiment of the present invention has been described above, the present invention is not limited to the configuration described in the above-described embodiment, but is within the scope of the claims. It also includes other possible embodiments and variations. For example, in FIG. 3 above, the suction pipe and the discharge nozzle are arranged close to the partition plate, but the present invention is not limited to this, and the suction pipe and the discharge nozzle may be arranged close to the side wall side of the annular gutter.

The verification test carried out for verifying the effect of the present invention will be described.
A suction pipe is provided on the partition plate side between the partition plate of the annular gutter and the side wall of the outer circumference, and a test is conducted to evaluate the state of dust accumulation in the annular gutter based on the presence or absence of a discharge nozzle, the presence or absence of an injection nozzle, and the presence or absence of a scraper. rice field.

With the discharge nozzle, the side wall of the annular gutter is provided with a discharge nozzle that discharges water toward both the bottom of the gutter, and with no discharge nozzle, the water supply nozzle that simply supplies water to the annular gutter is provided as a partition plate and the outer circumference as in Patent Document 1. It was provided between the side walls of the gutter.
With the injection nozzle, an injection nozzle for injecting water toward the inner peripheral surface of the partition plate was provided at the upper part of the side wall of the annular gutter, and with no injection nozzle, no injection nozzle was provided.
With the scraper, a scraper that abuts on the bottom of the annular gutter and scrapes up the dust accumulated on the bottom is attached near the suction port at the lower end of the suction pipe, and without the scraper, the scraper is not provided.
Table 1 shows a list of each test condition and test result.

The water pressure of the discharge nozzle and the injection nozzle was set to 30 MPa.
The evaluation of the dust accumulation state is that if there is almost no dust accumulation at the bottom of the gutter (dust thickness less than 1 cm) during the one-month test period ◎ (excellent), a little dust is accumulated (dust thickness 1 cm or more and 10 cm). If it is less than), it is evaluated as ○ (good), and if dust is considerably accumulated (dust thickness is 10 cm or more), it is evaluated as × (impossible).

The findings from Table 1 are listed below.
-In Examples 1 to 4, there was little dust accumulation at the bottom of the annular gutter.
-In Example 4 in which the injection nozzle was installed and the scraper was attached to the suction pipe, almost no dust accumulation was observed.
-In Comparative Examples 1 and 2 in which the discharge nozzle was not installed, a considerable amount of dust was accumulated. Even if the injection nozzle was installed without installing the discharge nozzle, the amount of dust did not change so much (see Comparative Example 2). From this, it was found that the discharge nozzle has a great effect on dust reduction.

10: Rotary sintered ore cooling device, 11: Hopper, 12: Upper fixed hood, 13: Central shaft, 20: Water-sealed sealing device, 21: Circular gutter, 21a, 21b: Side wall, 22: Top lid, 23: Partition plate, 24: Seal water, 25: Dust, 30: Suction pipe, 31: Discharge nozzle, 32: Scraper, 33: Injection nozzle

Claims (3)

It is provided in a rotary sinter cooling device having a hopper which is circular in a plan view and rotates in a horizontal plane with a central axis as a rotation axis and an upper fixed hood fixedly arranged so as to cover the upper surface of the hopper. It is a mechanism for discharging dust that accumulates inside the water-sealed sealing device.
The water-sealed sealing device is integrated with an annular gutter that stores sealing water and rotates in a horizontal plane together with the hopper, an upper lid that is integrated with the upper fixed hood and covers the upper surface of the annular gutter, and the upper lid that hangs down from the upper lid. It is provided with a partition plate that has a gap between the bottom of the annular gutter and is immersed in the sealing water.
The upper lid includes a suction pipe that is inserted into the sealing water and sucks dust accumulated on the bottom of the annular gutter, and a discharge nozzle that is inserted into the sealing water and discharges water toward the bottom of the annular gutter. A dust discharge mechanism inside a water-sealed seal device, which is characterized by being attached to each of the above. In the dust discharge mechanism in the water-sealed sealing device according to claim 1, the side wall of the annular gutter in which the injection nozzle for injecting water toward the inner peripheral surface of the partition plate faces the inner peripheral surface of the partition plate. A dust discharge mechanism inside a water-sealed seal device, which is characterized by being installed at the top. In the dust discharge mechanism in the water-sealed sealing device according to claim 1 or 2, a scraper that comes into contact with the bottom of the annular gutter and scrapes up the dust accumulated on the bottom is attached to the lower end of the suction pipe. A dust discharge mechanism inside a water-sealed seal device.

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