JP7425295B2 - Dust discharge mechanism in water sealing device - Google Patents

Description

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

The sintered ore charged into the blast furnace is manufactured by refining and agglomerating the raw iron ore powder, sintering it in a sintering machine, and then cooling it to a temperature at which it can be handled in a sintered ore cooling device. ing. Sintered ore discharged from a sintering machine generally has a sensible heat of 500°C to 700°C, and is cooled to 100°C to 150°C or lower by a sintered ore cooling device. A huge amount of sensible heat is wasted during cooling. Therefore, in the sintered ore cooling device, exhaust heat is recovered from the cooling air that has exchanged heat with the sintered ore. A rotary sintered ore cooling device is known as a sintered ore cooling device that can recover waste heat.

The rotary sintered ore cooling device has a hopper that is annular in plan view and rotates in a horizontal plane with a central axis as the rotation axis, and an upper fixed hood that is fixedly arranged to cover the upper surface of the hopper. There is. Hot sintered ore discharged from the sintering machine is continuously introduced into the hopper through a chute, and is cooled by cooling air supplied into the hopper from the bottom of the hopper. The cooling air supplied into the hopper exchanges heat with the sintered ore inside the hopper, and then is sent through the upper fixed hood to the dust remover and heat recovery boiler, where the heat is recovered. The cooled sintered ore is discharged onto a belt conveyor by a scraper installed at the lower end of the hopper.

In order to prevent air from entering the rotary sintered ore cooling device through the gap between the hopper and the upper fixed hood, the outer and inner peripheries of the rotary sintered ore cooling device are provided with such gaps. A water-sealing device is installed.
The water sealing device consists of an annular gutter that stores seal water and rotates in a horizontal plane together with a hopper, an upper lid that is integrated with an upper fixed hood and covers the upper surface of the annular gutter, and a gap between the bottom of the annular gutter and the upper lid that hangs down from the upper lid. and a partition plate that is immersed in seal water.

The cooling air that has exchanged heat with the sintered ore in the hopper contains sintered ore dust. This dust enters the seal water and accumulates at the bottom of the annular gutter. When the amount of dust accumulated at the bottom of the annular gutter increases, rotation of the annular gutter is hindered by friction with the partition plate, resulting in poor rotation of the hopper. In addition, since 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 when drying, forming a strong lumpy deposit. As a result, the rotary sintered ore cooling device may wear out and break.

Therefore, Patent Document 1 discloses that the water seal water is continuously discharged from the bottom of the water seal tank of the water seal device of the annular kiln, the suspended matter in the water seal water is separated, and the water seal water is transferred to the water seal tank. A technique is described in which the solid matter at the bottom of the water seal tank is removed and blockage is prevented by repeating the steps continuously.

Furthermore, Patent Document 2 discloses that a sealing member having shape flexibility and made of stainless steel is installed above the movable side partition plate on the cooling gas passage side to prevent dust from entering. In case of an intrusion, a water supply pipe and a drain pipe are installed inside the water seal box (annular gutter), and by supplying water with the water pipe and draining water with the drain pipe, dust accumulated in the water seal box will be removed during drainage. Techniques are described for removing dust that has been vacuumed and deposited within the water seal box.

Furthermore, Patent Document 3 discloses that a gas injection port is submerged in seal water while discharging water from a water discharge pipe that vertically fluctuates the water level of seal water in a water seal device installed at a coke charging inlet of a coke dry extinguishing equipment. describes a technique for disintegrating dust by injecting gas in the direction of a drain provided in an annular gutter and in the direction of dust, and discharging the disintegrated dust from the drain.

Japanese Unexamined Patent Publication No. 53-96543 JP2015-197228A Japanese Patent Application Publication No. 2013-181098

The present inventors discovered that the dust that entered the water sealing device adhered to and grew on the inner peripheral surface of the partition plate and the side wall of the annular gutter opposite thereto, and some of the dust became agglomerated into an annular gutter. It was discovered that by falling and accumulating at the bottom of the gutter, it promotes clogging of the annular gutter.
Hereinafter, in this specification, the side facing the central axis of the rotary sintered ore cooling device will be referred to as the inner peripheral surface side, and the opposite side will be referred to as the outer peripheral surface side.

Patent Document 1 describes that solid matter at the bottom of the water seal tank is discharged together with water seal water using a suction pipe, but when water is supplied to the water seal tank through an overflow pipe or the like, the water level in the water seal tank is kept constant. However, it is not possible to prevent dust from adhering to the inner peripheral surface of the partition plate and the side wall surface of the annular gutter facing thereto.

Patent Document 2 describes that dust that has entered the water seal box is removed by suction through a drain pipe, but dust that has accumulated in areas other than directly under the drain pipe is difficult to inhale, and the dust that has accumulated in the above-mentioned clumps It also cannot be removed by inhalation. In addition, as in Patent Document 1, water is supplied from the water supply pipe for the purpose of keeping the water level in the water seal box constant, and the water is supplied from the water supply pipe to the inner peripheral surface side of the partition plate and the annular gutter opposite thereto. It is not possible to prevent dust from sticking to the wall.

Additionally, Patent Document 3 describes a technique for discharging dust accumulated in an annular gutter from a drain port provided in the annular gutter, but in the case of a rotating annular gutter, a drain port cannot be provided. . Therefore, the technique described in Patent Document 3 cannot be applied to the water sealing device.

The present invention was made in view of the above circumstances, and it is possible to evenly remove the dust accumulated inside the water sealing device, thereby preventing malfunction of the hopper and wear and tear of the rotary sintered ore cooling device. The purpose of this invention is to provide a dust evacuation mechanism.

In order to achieve the above object, the present invention includes a hopper which is annular in plan view and rotates in a horizontal plane with a central axis as a rotation axis, and an upper fixed hood fixedly arranged to cover the upper surface of the hopper. A mechanism for discharging dust accumulated inside a water sealing device provided in a rotary sintered ore cooling device,
The water sealing device includes: an annular gutter that stores seal 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; comprising a bottom part of an annular gutter and a partition plate having a gap and immersed in the seal water,
The upper lid includes a suction pipe that is inserted into the seal water to suck in dust accumulated on the bottom of the annular gutter, and a discharge nozzle that is inserted into the seal water and discharges water toward the bottom of the annular gutter. are attached to each
When the suction pipe is provided near the center in the width direction of the annular gutter, the discharge nozzle is provided to discharge water toward the bottom of both side walls of the annular gutter,
When the suction pipe is provided along one side wall of the annular gutter, the discharge nozzle is provided so as to discharge water toward the bottom of the other side wall of the annular gutter. It is a feature.

In the present invention, while the annular gutter rotates in a horizontal plane, the suction pipe and discharge nozzle fixed to the non-rotating upper cover evenly remove dust accumulated at the bottom of the annular gutter. Dust accumulated at the bottom of the annular gutter is collected toward the suction pipe by water discharged from the discharge nozzle, and is sucked and removed from the suction port of the suction pipe.
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 inhaled and removed from the suction port of the suction pipe. Furthermore, the seal water is agitated by the water discharged from the discharge nozzle, and dust adhesion and adhesion to the side wall surface of the annular gutter and the partition plate are suppressed.

Further, in the dust discharge mechanism in a water sealing device according to the present invention, the injection nozzle that injects water toward the inner peripheral surface of the partition plate is arranged in the annular gutter facing the inner peripheral surface of the partition plate. It may be installed at the upper part of the side wall.
This agitates the seal water on the inner peripheral surface of the partition plate, prevents dust from adhering to the inner peripheral surface of the partition plate, and peels off the dust adhering to the inner peripheral surface of the partition plate.

Further, in the dust discharge mechanism in a water sealing device according to the present invention, a scraper that comes into contact with the bottom of the annular gutter and scrapes up 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 reliably absorbed and removed from the suction port of the suction pipe.

In the dust discharge mechanism in a water sealing device according to 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 cover evenly remove the dust accumulated at the bottom of the annular gutter. Since the dust is removed, it is possible to prevent malfunction of the hopper and wear and tear of the rotary sintered ore cooling device due to dust in the water sealing device.

FIG. 2 is a plan view of a rotary sintered ore cooling device. FIG. 2 is an end view taken along the line AA in FIG. 1; (A) Schematic diagram of a suction pipe and scraper that constitute the dust discharge mechanism in the water seal device according to an embodiment of the present invention, (B) Discharge nozzle that constitutes the dust discharge mechanism in the water seal device FIG. It is a schematic diagram of the injection nozzle which constitutes the dust discharge mechanism in the same water sealing device.

Next, embodiments embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention. Note that in this specification and the drawings, constituent elements having substantially the same functions are designated by the same reference numerals, and redundant explanation will be omitted.

FIG. 1 shows a plan view of a rotary sintered ore cooling device 10 that cools sintered ore discharged from a sintering machine (not shown), and FIG. 2 shows an end view taken along the line AA.
The rotary sintered ore cooling device 10 includes a hopper 11 which is annular in plan view and rotates in a horizontal plane about a central axis 13 as a rotation axis, and a non-rotating upper part fixedly arranged to cover the upper surface of the hopper 11. It has a fixed hood 12. The time required for one rotation of the hopper 11 is approximately 15 to 20 minutes.

As shown in FIG. 2, the upper fixed hood 12 has an opening on the lower surface, and water seals are provided on both sides of the upper fixed hood 12 to water-seal the gap between the hopper 11 and the upper fixed hood 12. Devices 20 are installed respectively.

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

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

When the suction pipe 30 is inserted into the inner seal water between the inner peripheral side wall 21b and the partition plate 23, the dust that has entered will adhere to the suction pipe 30 and stick to it, and as the stuck dust grows, the hopper 11 may occur. Therefore, it is preferable to insert the suction pipe 30 into the outer circumferential seal water between the outer circumferential side wall 21a and the partition plate 23. The suction port of the suction pipe 30 is placed near the bottom of the annular gutter 21.
Although the diameter of the suction pipe 30 is not limited, it is set to 50A in this embodiment.

A scraper 32 is attached near the suction port at the lower end of the suction pipe 30 in contact with the bottom of the annular gutter 21 to scrape up the dust 25 accumulated on the bottom. The scraper 32 has a wide angle with respect to the width direction of the bottom of the annular gutter 21 in order to reliably 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 approximately 1/2 of the seal water level. If the distance is too far, there is a risk that the dust once collected will spread, and if the distance is too short, the accumulated dust will be sucked in 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 circumferential seal water between the inner circumferential side wall 21b and the partition plate 23, the invading dust adheres to and adheres to the discharge nozzle 31, similar to the suction pipe 30. If the fixed dust grows, the hopper 11 may malfunction, so it is preferable to insert the discharge nozzle 31 into the outer seal water between the outer circumferential side wall 21a and the partition plate 23.

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

In addition, in the dust discharge mechanism in the water sealing device according to the present embodiment, as shown in FIG. A spray nozzle 33 may be installed to spray water toward the inner circumferential surface of the pipe. The tip of the injection nozzle 33 is inserted into the seal water 24, and high-pressure water is injected toward the inner peripheral surface of the partition plate 23. The pressure during 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 removing the dust 25 and preventing the dust 25 from adhering to the entire inner peripheral surface of the partition plate 23.
Note that the diameter of the injection nozzle 33 is the same as that 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, and within the scope of the claims. It also includes other possible embodiments and modifications. For example, in FIG. 3, the suction pipe and the discharge nozzle are arranged close to the partition plate, but the invention is not limited to this, and they may be arranged close to the side wall of the annular gutter.

A verification test conducted to verify the effects of the present invention will be described.
A suction pipe was installed on the partition plate side between the partition plate and the outer peripheral side wall of the annular gutter, and a test was conducted to evaluate the state of dust accumulation in the annular gutter by the presence or absence of a discharge nozzle, the presence or absence of an injection nozzle, and the presence or absence of a scraper. Ta.

With a discharge nozzle, a discharge nozzle is provided to discharge water toward both the side wall and the bottom of the annular gutter, and with no discharge nozzle, a water supply nozzle that simply supplies water to the annular gutter is connected to the partition plate and the outer periphery, as in Patent Document 1. It was installed between the side walls.
In the case with an injection nozzle, an injection nozzle that injects water toward the inner circumferential surface of the partition plate was provided on the upper part of the side wall of the annular gutter, and in the case without an injection nozzle, no injection nozzle was provided.
In the case with a scraper, a scraper that came into contact with the bottom of the annular gutter and scraped up the dust accumulated on the bottom was attached near the suction port at the lower end of the suction pipe, and in the case without a scraper, no scraper was provided.
Table 1 shows a list of test conditions and test results.

The water pressure of the discharge nozzle and the injection nozzle was 30 MPa.
The dust accumulation condition was evaluated during the one-month test period: ◎ (excellent) if there was almost no dust accumulation at the bottom of the annular gutter (dust thickness less than 1 cm), or ◎ (excellent) if there was a slight accumulation of dust (dust thickness 1 cm or more and 10 cm). ○ (good) if less than 10 cm), and × (unsatisfactory) if there was a considerable amount of dust accumulated (dust thickness 10 cm or more).

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 an injection nozzle was installed and a scraper was attached to the suction pipe, almost no dust accumulation was observed.
- In Comparative Examples 1 and 2 in which no discharge nozzle was installed, a considerable amount of dust was accumulated. Even when an injection nozzle was installed without a discharge nozzle, no significant change was observed in the amount of dust (see Comparative Example 2). This revealed that the discharge nozzle was highly effective in reducing dust.

10: Rotary sintered ore cooling device, 11: Hopper, 12: Upper fixed hood, 13: Center shaft, 20: Water sealing device, 21: Annular 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)

A rotary sintered ore cooling device has a hopper that is annular in plan view and rotates in a horizontal plane about a central axis as a rotation axis, and an upper fixed hood that is fixedly arranged to cover the upper surface of the hopper. A discharge mechanism for dust accumulated inside a water ring type sealing device,
The water sealing device includes: an annular gutter that stores seal 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; comprising a bottom part of an annular gutter and a partition plate having a gap and immersed in the seal water,
The upper lid includes a suction pipe that is inserted into the seal water to suck in dust accumulated on the bottom of the annular gutter, and a discharge nozzle that is inserted into the seal water and discharges water toward the bottom of the annular gutter. are attached to each
When the suction pipe is provided near the center in the width direction of the annular gutter, the discharge nozzle is provided to discharge water toward the bottom of both side walls of the annular gutter,
When the suction pipe is provided along one side wall of the annular gutter, the discharge nozzle is provided so as to discharge water toward the bottom of the other side wall of the annular gutter. Features a dust discharge mechanism inside the water sealing device. 2. The dust discharge mechanism in a water sealing device according to claim 1, wherein the injection nozzle that injects water toward the inner circumferential surface of the partition plate is located on a side wall of the annular gutter facing the inner circumferential surface of the partition plate. A dust discharge mechanism inside the water sealing device is characterized by being installed at the top. 3. The dust discharge mechanism in a water seal device according to claim 1, wherein a scraper is attached to the lower end of the suction pipe, the scraper coming into contact with the bottom of the annular gutter and scraping up dust accumulated on the bottom. A dust discharge mechanism inside a water-sealing device featuring the following.

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