WO2018016719A1

WO2018016719A1 - Slag stabilization treatment system

Info

Publication number: WO2018016719A1
Application number: PCT/KR2017/003956
Authority: WO
Inventors: 오영미; 박장수
Original assignee: (주)유진에코씨엘
Priority date: 2016-07-19
Filing date: 2017-04-12
Publication date: 2018-01-25
Also published as: KR101727300B1

Abstract

Introduced is a stabilization treatment technique for slag generated in an ironmaking process. A nozzle spray angle and a fall distance (h) representing the distance until molten slag discharged from a slag pot (10) collides with a fluid sprayed from a nozzle (20) are constantly maintained, and a tundish for retaining molten slag is not arranged between the slag pot (10) and the nozzle (20).

Description

Slag stabilization treatment system

The present invention relates to a stabilization treatment technology of the slag generated in the steelmaking process, in particular to a technique for producing a stabilized slag ball by spraying a high pressure gas to the slag in the molten state.

Large amounts of slag are generated in the steelmaking process. Among them, blast furnace slag is used in various ways, such as concrete aggregates or mixed materials, cement additives, steelmaking slag has limited volume stability due to its low volume stability.

The low stability of steelmaking slag is mainly due to unreacted free lime (free-CaO). Free lime or magnesium forms hydroxide when it comes in contact with water and expands in volume. Therefore, aging is required, and the time is not only very long, but also the utilization is low due to low quality reliability after aging.

Steelmaking can be mainly divided into steelmaking by converters and electric furnaces. The steelmaking process by converters is carried out in order of molten iron pretreatment, converter refining, secondary refining and continuous casting.

A molten iron pretreatment process is a process of mainly removing sulfur (S) component from the hot metal manufactured by melting iron ore in a furnace.

The converter refining process is a process of removing carbon and impurities in molten iron in the form of oxides of CO gas or slag by charging molten iron and scrap metal into the converter and blowing oxygen gas of high purity through a lance. The molten iron from which impurities are removed through refining is molten steel.

This converter refining process is a method of dewatering and purifying the delineation in the decarburization converter by tapping the molten iron in the decarburization converter, and delineation and decarburization in a single converter. Method, so-called double slag method.

The steelmaking process by electric furnace is an oxidation process that removes impurities in the scrap metal by adding quicklime and blowing oxygen after dissolving scrap metal, and removes oxygen and sulfur by adding coke and quicklime to the molten steel again from the ladle. It can be divided into a reduction process. Slag is produced about 80% in the oxidation process and about 20% in the reduction process.

Slag generated through the steelmaking process as described above, for example, converter slag will vary depending on the raw material blending ratio, but generates about 150 ~ 180kg per tonne of molten steel. However, such steelmaking slag has low utilization due to limitations due to the volume expansion mechanism as described above.

The slag stabilization technique proposed to solve the above problems and increase the utilization of slag generated in the steelmaking process is atomizing method. Atomizing is performed by spraying high pressure compressed air while dropping molten slag to squeeze the slag to quench the slag, thereby obtaining slag balls.

The atomized slag ball has a very hard surface and is spherical in shape, so it is easy to work with. In addition, it has excellent physical and chemical properties and volume stability, such as low absorption rate and no elution of heavy metals. Slag balls are currently used in the industry as abrasives, press block materials, and weight materials.

In Korean Patent No. 1194277, a slag atomizing treatment apparatus is introduced. As shown in this patent, the conventional apparatus is configured such that the molten slag discharged from the slag port passes through the tundish and then falls into the gas injection zone. Hydraulic cylinders were also used in the device for tilting the slag port.

Conventionally, the tundish disposed between the slag port and the nozzle causes the following problems.

First, the high temperature slag of 1400 ~ 1550 ℃ damages the tundish area of the dropping point, and the slag is cooled and fixed there, so it is necessary to remove the heavy slag by using heavy equipment such as a fork lane. Therefore, in the related art, not only two or more continuous operations are difficult, but also the slag processing time is delayed and the yield is low, and the cost increase due to frequent replacement of tundish is also a problem.

Secondly, since the tundish is disposed between the slag port and the nozzle, the distance between the tundish and the ground must be narrowed, so that the high pressure gas injection zone by the nozzle could not be expanded and the large-scale slag treatment was difficult.

Thirdly, the tundish is used to control the flow or flow rate of the molten slag discharged therefrom, but the molten slag is partially cooled and fixed as it is discharged from the tundish, which is inconsistent with a certain shape and quantity at a predetermined position. There was a problem that does not fall into. In addition, since the slag stuck in the tundish as well as the slag port after the operation must be removed, there is also a problem of excessive workload and time.

As mentioned above, the inventors have found that there is more to lose than the benefit of using tundish. Especially when using tundish, a large amount of slag treatment is difficult to expect.

On the other hand, as mentioned above, the hydraulic cylinder was conventionally used for tilting the slag port, but the hydraulic cylinder method is applicable when the cylinder is used less than five times a day in consideration of wear of the cylinder or replacement of hydraulic oil. It is not suitable as a mass processing equipment for slag that must be used more than once. In addition, in a slag treatment environment in which dust and high heat are generated, there is a problem that a fire occurs due to leakage.

The present invention is based on the above-mentioned recognition, and aims to provide a system and method for improving the efficiency of slag stabilization treatment and mass processing.

Still other objects of the present invention will be understood from the following description.

According to the present invention for achieving the above object, the tundish that is disposed between the slag port and the nozzle for the retention of the molten slag is omitted, and the fluid is directly injected from the nozzle to the slag discharged from the slag port falling.

According to the present invention, the tundish may be omitted, thereby ensuring a sufficient high pressure fluid injection space between the slag port and the nozzle, and thus the arrangement of the nozzle may be more freely designed.

According to the present invention, the nozzle may be installed in three stages above and below. By way of example, the nozzle may comprise an upper main nozzle portion; A sub nozzle portion disposed on both sides of the main nozzle portion below the main nozzle portion; And a lower nozzle part disposed under the sub nozzle part and having a larger left and right width than the main nozzle part.

The molten slag is quenched primarily by the main nozzle portion, whereby the slag not properly quenched can be further cooled by the lower nozzle. The sub nozzle part may be operated when the flow of slag discharged from the slag port is partially changed or the amount of discharge slag is large.

The nozzle may be a laval jet nozzle or a single hole straight nozzle. Considering the degree of deceleration until reaching the molten slag falling from the nozzle, the injected fluid velocity may be about Mach 1.5-3. The fluid ejected from the nozzle will primarily be air, and nitrogen or other inert gases can be used. Additionally water may be sprayed.

For the slag stabilization treatment, the fluid injection amount (mass flow rate) relative to the amount (mass flow rate) of slag discharged from the slag port needs to be controlled within a certain condition. And it is preferable that the falling distance and nozzle spray angle until molten slag discharged from a slag port hit a fluid are kept constant.

According to the present invention, the nozzle position is configured to move in conjunction with the tilting movement of the slag port so that the nozzle injection angle and the drop distance can be constantly adjusted.

According to the present invention, the nozzle is mounted on the nozzle mounting wall for preventing the slag from scattering backward, and the nozzle spraying angle and the fall distance can be constantly adjusted by moving the nozzle mounting wall downward as the slag port is tilted. It can be configured to be.

According to the present invention, the tilting device for tilting the port for discharge of the slag, the port table on which the slag port is seated; A locking member for fixing the slag port seated on the port table; And a tilting drive mechanism for pivoting the port table and rotating the port table.

The slag stabilization treatment is carried out by placing the slag excluded from the converter or electric furnace in the port and transporting it to the bogie, then placing the slag port on the port table and fixing it with a locking member, and tilting the port table with a tilting drive mechanism to drop the slag. Can be performed. The tilting drive mechanism may include a gear assembly that transmits a driving force of the electric motor and the motor.

In the process of quenching high-temperature molten slag falling by injecting high-pressure air, finer balls or dust are scattered or high heat is diffused to the surroundings, which may result in a poor workplace environment.

In the conventional case, the slag stabilization treatment was only done in the building. In this case, in order to take out the slag ball products piled up inside, heavy equipment such as payloader enters the building and collects them in the screw-type discharge device, which is not only inefficient but also poorly performed in the workplace environment. There was a difficulty.

According to the present invention, the slag scattered forward by the fluid injected from the nozzle can be collected in the sealed rotary container. Rotary containers should be equipped with a sorting function in addition to collecting slag balls. The rotary container needs to be rotatable for sorting, and a hole for sorting slag balls may be formed in the circumferential surface of the rear end.

Small and light of slag balls quenched by the fluid are transported far to the rear end of the rotary container, and large and heavy ones are mainly stacked on the front side of the rotary container. Slag balls with a small particle diameter, for example 10 mm or less, may be selectively collected through holes in the rear end of the rotary container. The quench slag remaining after the sorting may, for example, be discharged by tilting the container.

When using the sealed rotary container as described above, it is necessary to discharge and cool the dust or high heat in the rotary container to the outside. To this end, an exhaust port is provided at the rear end of the rotary container and collected by the dust collector. If the nozzles and tilting devices are installed in a building, the collecting device may be connected to the exhaust of the building.

Dust collector, vertical spraying cooling tower connected to the exhaust port of the rotary container or structure; A separator connected to the rear end of the spraying cooling tower; A water tank into which water discharged from the spraying cooling tower and the separator is introduced; And at least one blower fan provided on the exhaust line of the structure to provide a dust discharge pressure and flowing from the structure to the separator through a water spray cooling tower.

According to the present invention as described above, the work for removing the slag stuck in the tundish is unnecessary, and since the nozzle can be arranged three or more steps up and down under the slag port, the efficiency of slag stabilization treatment is high and Slag stabilization treatment is possible.

In addition, quenched slag balls are collected and sorted in the rotary container, so no separate slag ball collection and sorting operations are required, and dust and high heat flowing into the rotary container can be discharged and cooled uniformly, thereby improving the efficiency of slag stabilization. High and bulk slag treatment is possible.

1 is a view for explaining the quenching treatment of molten slag according to an embodiment of the present invention,

2 is a view showing a nozzle mounting wall on which a nozzle and a nozzle are mounted according to an embodiment of the present invention;

3 is a view showing a slag port tilting device according to an embodiment of the present invention,

4 is a schematic perspective view of the port table shown in FIG.

5 is a view showing a rotary container according to an embodiment of the present invention,

6 is a view showing a dust collecting apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The drawings are schematically shown for the description of the embodiments according to the invention, and the description of the well-known technology may be omitted, and the same components or parts are denoted by the same reference numerals as much as possible for the convenience of description.

1 shows a slag port 10 containing molten slag and a nozzle 20 for spraying high pressure air forward for stabilization of molten slag discharged therefrom.

Referring to FIG. 1, unlike the prior art, no tundish for retaining molten slag is disposed between the slag port 10 and the nozzle 20. High pressure air is directly injected from the nozzle 20 to the molten slag discharged by tilting the slag port 10 about the horizontal axis 53.

The farther the distance from the nozzle 20 to the slag falling, the smaller the energy delivered to the slag by the high pressure air. Therefore, the distance between the nozzle 20 and the hot water outlet of the slag port 10 is preferably adjusted as close as possible.

For the slag stabilization treatment, for example, the slag port 10, which is set up at 90 °, should be gradually inclined to discharge molten slag, and in order to continuously discharge the molten slag, the slag port 10 should be gradually inclined. The slag port 10 tilting apparatus will be described later.

Although the slag port 10 is gradually inclined during the slag discharge process, the angle at which the falling slag strikes the high pressure air, that is, the nozzle injection angle, remains the same. The nozzle spray angle can be seen, for example, at an angle to the spray centerline A directed by the nozzle 20 with respect to the imaginary horizontal plane.

In addition, during the atomizing process, the falling distance until the slag discharged from the slag port 10 hits the high-pressure air injected from the nozzle 20 is kept constant. For example, when the distance from the hot water outlet of the port 10 to the injection center line A is h at the time of initial slag discharge, this distance h may remain the same until the time when slag discharge is completed.

As shown in FIG. 1, the nozzle 20 is fixedly mounted to the nozzle mounting wall 30. The nozzle mounting wall 30 is a member on which the nozzle 20 is mounted and a slag blocking wall for preventing the slag discharged from the slag port 10 from scattering backward. A general apparatus for supplying high pressure air to the nozzle 20 behind the nozzle mounting wall 30 is omitted.

The nozzle mounting wall 30 can be moved inclined downward by the moving mechanism 31 provided behind it. The movement of the nozzle mounting wall 30 by the moving mechanism 31 is linked to the inclination angle of the slag port 10. The moving mechanism 31 may be a hydraulic cylinder having a rod 31a.

The nozzle mounting wall 30 need not be a cement wall at all. It is suitable to mount and move the nozzle 20 and is provided in size, thickness and material. The moving mechanism 31 behind the nozzle mounting wall 30 is blocked by the mounting wall 30 so that molten slag or dust does not flow in.

When the inclination angle of the slag port 10 reaches a preset angle, the high pressure air is injected from the nozzle 30, and the moving mechanism 31 moves in conjunction with the tilting movement of the slag port 10 to move the nozzle mounting wall 30. ) Inclined downward. Keep the drop distance and nozzle spray angle as constant as possible.

When the falling distance of the molten slag discharged initially from the slag port 10 is h and the falling distance when the slag is completely discharged from the port 10 is h ', h = h' is preferable. Since the slag port 10 is tilted, the nozzle mounting wall 30 goes straight, so these values are difficult to completely match. However, the atomizing of the slag is not very fine and delicate, so it can be adjusted to an almost or substantially consistent degree.

When the nozzle injection angle when the molten slag is discharged from the slag port 10 is A and the nozzle injection angle as the nozzle mounting wall 30 is moved later is A ', A = A' is maintained. Tilting while moving the nozzle mounting wall 30 to be close to the movement of the slag port 10 may also be considered, but the apparatus is complicated.

Under the nozzle 20 or the nozzle mounting wall 30, an inclined bottom plate 40 inclined downward is provided. Most slag hit by high pressure air will fly forward, but otherwise slag may fall near the nozzle 20. The inclined bottom plate 40 allows slag falling near the nozzle 20 to flow forward to facilitate collection.

When the slag is initially discharged from the tap opening of the port 10, it will be discharged by a predetermined amount at a predetermined position, but as time passes, partial solidification occurs at the tap and the discharge position may be changed or the discharge may be increased or decreased. According to the embodiment, the arrangement of the nozzle 20 is free, and it is possible to cope with the fluctuation situation during the operation and to process the slag in a large capacity.

2 shows the arrangement of the nozzles provided on the nozzle mounting wall 30. The nozzle 20 is arranged in multiple stages in the vertical direction, and is also widely disposed in the left and right directions.

Referring to FIG. 2, according to an embodiment, the nozzle 20 includes a main nozzle part 21 at an upper side, a sub nozzle part 22 disposed below both main nozzle parts, and a sub nozzle part at both sides of the main nozzle part. It is provided with a large lower nozzle portion 23 disposed below and wider than the main nozzle portion.

The main nozzle part 21 is a nozzle which plays a main role in quenching molten slag falling from the slag port 10, and most molten slag is quenched by the main nozzle part 21. The nozzle spray angle may be set based on the spray center line of the main nozzle portion 21.

The lower nozzle portion 23 additionally quenchs the slag that has not been quenched by the main nozzle portion 21. Since the falling direction of the slag may be changed by the influence of the high pressure air from the main nozzle portion 21, the lower nozzle portion 23 may be distributed in a wider horizontal direction than the main nozzle portion 21. In the case of a single hole nozzle, the left and right widths are formed long.

In the case where the molten slag that is not quenched primarily by the main nozzle portion 21 is secondarily cooled by the lower nozzle portion 23, the production ratio is not high. Therefore, it is necessary to quench the molten slag as much as possible by the primary treatment. In addition, as mentioned above, the slag discharged from the hot water outlet of the slag port 10 may be changed in the discharge direction during operation.

The sub-nozzle unit 22 assists the main nozzle unit 21 so that the molten slag can be atomized as much as possible by primary contact, and the nozzle is provided to cope with the above-mentioned fluctuations during operation. The sub nozzle part 22 is widely disposed to the left and right of the main nozzle part 21 and is disposed at a distance directly below the main nozzle part 21, preferably within 50 cm, more preferably within 30 cm. When the amount of molten slag to be treated is large or there is a variation in the slag discharge direction, the sub nozzle unit 22 can be operated.

Left and right of the nozzle mounting wall 30 is provided with a blocking wall 32 in the form of a wing. The blocking wall 32 is installed for the purpose of heat dissipation to prevent the slag from scattering backward and to block the generated high heat. The blocking wall 32 is detachably arranged on the left and right sides of the nozzle mounting wall 30.

3 shows a tilting device 50 for tilting the slag port 10 for the discharge of slag.

As shown in FIG. 3, the tilting device 50 according to the embodiment includes a port member 51 on which the slag port 10 is seated, and a locking member for fixing the slag port 10 seated on the port table 51. And a tilting drive mechanism for pivoting the port table 51 and rotating the port table 51.

3 and 4, the port table 51 is formed in a shape in which the slag port 10 is stacked and can be seated thereon. Although it may vary depending on the depth of the pot table 51, the mouse 51a which is recessed downward concave for discharging slag in the area where the tapping hole of the slag port 10 is located in the seated state is preferably To be prepared.

In general, the slag port 10 is provided with trunnions protruding from side to side for holding the port 10. The port table 51 may be formed with a guide groove for entering the trunnion downward, the locking member is configured to lock the trunnion across the guide groove, or various other known techniques can be applied. There will be.

The tilting drive mechanism may be composed of a gear assembly which transmits the driving force of the electric motor 56 and the electric motor 56 to the port table 51. The gear assembly may include a main gear 52, a sub gear 54, a gear box 55, and a drive shaft 57.

The port table 51 is axially fixed to the main gear 52. The driving force of the electric motor 56 is transmitted to the main gear 52 through the gear box 55 and the sub gear 54, the port table 51 connected to the horizontal shaft 53 by the rotational force of the main gear 52 Is rotated.

The rotational force transmission of the main gear 52 causes the port table 51 to be rotated by the horizontal axis 53 or a gear corresponding to the main gear 52 is provided on the port table 51 to center the horizontal axis 53. As such, the port table 51 may be implemented in such a manner as to rotate.

A blocking film 58 may be installed between the port table 51 and the gear assembly. For example, a blocking film 58 is provided at a portion of the main gear 52 that faces the port table 51 so that high heat, dust, slag, and the like do not enter.

FIG. 5 shows a rotary container 60 configured in a closed type to easily collect and sort slag quenched by nozzle injection.

As shown in FIG. 5, the rotary container 60 according to the embodiment is provided with a slag inlet 63 at the front and a support body rotatably supporting the main body 61 and the main body 61 provided with the exhaust port 64 at the rear. A frame (not shown) and rotating mechanisms (65, 66, 67) for providing a rotational force to the body.

The main body 61 is formed in a cylindrical shape, and the inlets 63 and the exhaust ports 64 are provided with extensions 63a and 64a for seating the main body 61 on the support frame. A bearing may be interposed between the extensions 63a and 64a and the support frame, and the driving force of the motor 67 is transmitted to the main body 61 by the engagement gears 65 and 66.

The through-hole 62 for sorting the collected quench slag is formed in the peripheral surface of the rear end of the main body 61. The quenching slag forwarded by the nozzle injection is introduced into the main body 61 through the inlet 63, and the small-sized slag ball transported far to the rear end of the main body 61 rotates the main body 61. The through hole 62 is selected.

The slag left in the main body 61 after the operation can be discharged by tilting the main body in the inlet 63 direction, or by providing an opening and closing door (not shown) in the main body 61 itself. The rotary container 60 may be configured to be mobile.

The exhaust port 64 of the main body 61 is provided with a pressure for high heat and dust discharge. Even though the through hole 62 is formed at the rear end of the main body 61, the dust and the high heat inside the main body 61 can be led to the exhaust port 64 by adjusting the pressure provided to the exhaust port 64.

FIG. 6

shows collecting devices

70, 80, 90, and 100 for collecting and cooling dust or high heat discharged from the exhaust port 64 of the rotary container 60. L1 to L5 are transfer lines for dust or moisture.

As shown in Figure 6, the dust and the like discharged from the exhaust port 64 is supplied to the bottom of the cooling tower 70 through the transfer line L1. Cooling tower 70 is configured in a vertical type, while the high heat and dust is transported to the upper, it is cooled and removed by a plurality of sprayers 71 arranged in multiple layers up and down. The water after the watering is collected in the water tank 100 through the transfer line L4.

Dust or high heat passing through the cooling tower 70 is supplied to the separator 80 through the transfer line L2. Here, the gas and the water are separated, the gas is discharged to the outside through the blower 90 through the transfer line L3, the moisture is collected in the water tank 100 through the transfer line L5.

The system for the above-mentioned slag stabilization process was examined. In the slag stabilization treatment method according to the present invention, since the system as described above can be used as it is, a brief look at the slag stabilization treatment method.

The slag stabilization treatment method according to the embodiment includes the steps of discharging molten slag by tilting the slag port, and rapidly cooling by injecting high pressure air into the molten slag free-falling from the slag port using a nozzle at high speed, further melting The method may further include recovering and cooling the dust or high heat generated during the quenching of the slag.

There is no tundish for retaining molten slag between the slag port and the nozzle, and fluid is injected directly from the nozzle to the molten slag discharged from the slag port.

The nozzle position is moved so that the nozzle ejection angle and the drop distance from the slag discharged from the slag port to strike the ejected fluid from the nozzle can be kept constant.

The slag stabilization treatment system described above and the process using the same may be used to adjust the nozzle spray angle or drop distance, to collect the quench slag, and to discharge and cool the dust or high heat generated during the slag quenching process.

While specific embodiments of the present invention have been shown and described, it should be understood that the present invention may be variously modified or modified without departing from the spirit of the invention as set forth in the claims below.

[Description of the code]

10: slag port 20: nozzle

21: main nozzle portion 22: sub nozzle portion

23: lower nozzle portion 30: nozzle mounting wall

40: inclined bottom plate 50: tilting device

51: port table 51a: mouse

52: main gear 54: subgear

55: gearbox 56: electric motor

60: rotary container 61: main body

70: cooling tower 80: separator

90: blower 100: water tank

Claims

A tilting device for fixing and rotating the slag port on a horizontal axis; And

A nozzle for injecting fluid forward toward the slag discharged by tilting the slag port;

Including;

A nozzle mounting wall on which the nozzle is mounted, for preventing slag from scattering backwards; And

As the slag port is tilted, the nozzle mounting wall is moved downward so that the falling distance from the slag discharged from the slag port to the high pressure air injected from the nozzle is kept constant, and the slag port is maintained. A moving mechanism for maintaining a constant nozzle spray angle at which slag falling even inclined gradually hits high pressure air;

Further provided,

It is provided below the nozzle mounting wall, and further comprises an inclined bottom plate inclined so that the slag dropped in the vicinity of the nozzle mounting wall flows forward,

The nozzle provided on the nozzle mounting wall,

A main nozzle unit provided at an upper part and serving as a main for quenching slag falling from the slag port;

A sub nozzle unit disposed at both sides of the main nozzle unit below the main nozzle unit and configured to atomize slag by assisting the main nozzle unit; And

A large lower nozzle portion disposed below the sub nozzle portion and further quenched slag that is not quenched by the main nozzle portion, and disposed wider to the left and right than the main nozzle portion;

Including;

The nozzle mounting wall is moved in conjunction with the inclination angle of the slag port,

No tundish is placed between the slag port and the nozzle, fluid is injected directly from the nozzle into the slag discharged from the slag port,

10. A slag stabilization treatment system according to claim 1, wherein the nozzle position is movable so that the nozzle spray angle with respect to the horizontal plane and the falling distance from the slag discharged from the slag port to the hitting fluid injected from the nozzle can be kept substantially constant.
The method of claim 1, wherein the tilting device,

A port table on which the slag port is seated;

A locking member for fixing the slag port seated on the port table; And

And a tilting drive mechanism for pivoting the port table and rotating the port table.
The method of claim 2, wherein the port table,

A slag stabilization treatment system comprising a mouse recessed downwardly for discharging slag in a region corresponding to a hot tap of a slag port.
The method according to any one of claims 1 to 3,

Further comprising a rotary container for collecting the slag scattered forward by the fluid injected from the nozzle,

Rotary container,

A main body provided with a slag inlet in the front and an exhaust in the rear;

A support frame rotatably supporting the main body; And

Rotation mechanism to provide a rotational force to the body;

Including;

Slag stabilization treatment system, characterized in that the through-hole formed on the circumferential surface for sorting the collected slag at the rear end of the main body.
The method of claim 4, further comprising a dust collector connected to the rotary container,

Dust collector,

A vertical spraying cooling tower connected to the exhaust port;

A separator connected to the rear end of the spraying cooling tower;

A water tank into which water discharged from the spraying cooling tower and the separator is introduced; And

And at least one blower fan provided on the discharge line for providing dust discharge pressure to the rotary container exhaust port and flowing from the rotary container to a separator separator via a sprinkler cooling tower.
The method according to any one of claims 1 to 3,

Further comprising a dust collector for collecting dust generated in the structure is installed the tilting device and the nozzle,

Dust collector,

Vertical spraying cooling tower connected to the exhaust port of the structure;

A separator connected to the rear end of the spraying cooling tower;

A water tank into which water discharged from the spraying cooling tower and the separator is introduced; And

And at least one blower fan provided on the discharge line from the structure to the dust outlet pressure and flowing from the structure to the separator through a water spray cooling tower.