KR101157571B1 - Apparatus and Method for Slag Dry Granulation - Google Patents

Abstract

Provided are a slag dry treatment apparatus and method for granulating a hot molten slag generated in the metal industry including the steel industry, in particular dry.
The slag dry processing apparatus may include, as an example, an apparatus main body; and a slag impingement rotating body provided to enable collision of the molten slag introduced into the apparatus main body. And rotational flow cooling gas forming means provided in the main body of the apparatus so as to form slag cooling and heat transfer, and to form a cooling gas rotational flow passing through the main body of the apparatus.
According to the present invention, while improving the dry granulation workability of the molten slag and the quality of the granulated slag, in particular, during the granulation process of the molten slag, as well as recovering the heat energy from the hot slag, the efficiency is improved. An improved effect can be obtained that enables the provision of energy-efficient equipment.

Description

Apparatus and Method for Slag Dry Granulation

The present invention relates to a slag dry treatment apparatus and method, and more particularly, to improve the dry operation of molten slag or the quality of the treated slag particles, and in particular, to recover heat generated during hot slag treatment. The present invention relates to a slag dry treatment apparatus and a method for providing a more energy-efficient facility.

In the metal industry, including the steel industry, slag is produced at high temperatures. For example, while molten slag generated during blast furnace operation is recently used as reinforcement material for various aggregates or cover material such as roads, research is being conducted on the treatment and reuse of such slag.

On the other hand, as for the treatment of such molten slag, an aggregate slag treatment, a crushed slag treatment, a dry slag granulation (granulation) treatment, or the like is known.

For example, in the case of the aggregate slag treatment, molten slag is poured into the slag yard and sprinkled when it becomes a suitable thickness.

By the way, in the case of the lumped slag treatment through such watering, there is a problem that it takes a long time.

On the other hand, crushed slag treatment differs in that molten slag is introduced into a large cooling water tank, and slag granulation (granulation) is realized by rapid quenching the slag at higher speed than in the case of the aggregate slag treatment. In other words, in terms of slag granulation, crushed slag treatment may be referred to as more direct granulation of molten slag.

However, in the case of the hydrocracking treatment, since a minute amount of water necessarily exists between the hydrocracked slag particles, a problem occurs in that the slag particles are cured. In addition, when the slag is used in a cement factory, since it is necessary to dry again, a separate drying cost is incurred, and since the surface neutralization of the slag particles proceeds by carbon dioxide gas in the dry gas, the performance of the slag used for cement decreases. Is generated.

In particular, since such cracked quenched slag particles easily generate cracks, other problems with low strength of the slag unit particles also occur.

Therefore, instead of the aggregate slag treatment through sprinkling or the slag treatment of water chains, a technique is known in which dry slag is cooled and granulated.

For example, Korean Patent Laid-Open Publication No. 2004-0056064 discloses a method of dry-processing hot molten slag.

However, in the case of the above-mentioned patent, the degree to which slag particles are simply dropped and collided with the rotating body and scattered by air is blown, and the air is blown. In fact, the slag treatment efficiency is not high. In particular, the recovery of heat energy from high-temperature slag and Is not relevant.

For example, the temperature of the molten slag generated in the blast furnace has a large amount of thermal energy of about 1400 ℃, but the published patent is not related to the recovery of thermal energy generated during such slag granulation process.

Although not shown in the drawings, the recovery of slag retention heat in the dry treatment process of such hot molten slag is usually performed by granulating molten slag to within 5 mm in diameter to expand the surface area, and then with a suitable cooling medium. This can be achieved through contact.

However, in the case of the published patent, the transfer (exchange) of the slag heat to the cooling medium (air) is made, and a technology for heat recovery has not been disclosed separately.

In particular, in the case of the conventional slag dry treatment, for example, in the case of the published patent, since the slag converted to the particles in the molten state has a high viscosity of the surface at a high temperature state, the slag particles easily re-melt each other, or the granulation equipment Another problem has arisen that grows attached to the wall.

Therefore, such re-sintering of the slag particles and deposition of equipment have made it difficult to operate the apparatus normally, or the accumulated slag deposits have lowered the heat transfer rate to the cooling medium (fluid), and the heat recovery rate is lowered as the apparatus is operated. .

In particular, when re-fusion between slag particles occurs, the diameter of the slag particles increases, which makes it difficult to secure a sufficient cooling rate, so that crystals in the slag particles grow rather, and it is difficult to recycle high value resources such as cement raw materials. It is.

 On the other hand, in order to prevent re-fusion of the slag particles, it is necessary to secure a space in which the slag particles can be sufficiently scattered, resulting in cost problems in the installation of the facility, and such increased space is conversely through the cooling medium. This will lower the cooling efficiency.

Accordingly, immediately after granulation of molten slag, it is possible to rapidly cool the slag with a minimum amount of cooling medium to ensure the resource value of the slag particles, and to sufficiently increase the collision time and residence time between the hot slag and the cooling medium. There is a need for a dry treatment (assembly) technique of slag that increases the heat recovery rate and lowers the viscosity of the particle slag to prevent re-fusion.

SUMMARY OF THE INVENTION The present invention has been proposed to solve the conventional problems as described above, and an object of the present invention is to provide a slag dry treatment apparatus and method for improving molten slag dry treatment (granulation) operability or quality of treated slag particles. To provide.

In addition, another object of the present invention is to provide a slag dry treatment apparatus and method for increasing the recovery of heat energy from the hot slag generated during the granulation of molten slag to provide a more energy-efficient equipment. .

As one technical aspect to achieve the above object, the present invention provides an apparatus comprising: an apparatus main body;

A slag impingement rotating body provided to the apparatus body so as to allow collision scattering of molten slag injected therein; And,

Rotating flow cooling gas forming means provided in the main body of the apparatus so as to form a cooling gas rotating flow through which the slag cooling and the heat are transmitted, and pass through the main body of the apparatus;

It provides a slag dry treatment device configured to include.

In another aspect, the present invention, the molten slag is injected into the rotating body to scatter the slag in the form of particles in the set space; And,

Supplying a vortex flow gas into the setting space to enable rapid cooling and heat recovery of the semi-fused slag particles through contact with scattered slag particles;

It provides a slag dry treatment method comprising a.

According to the slag dry treatment apparatus and method of the present invention as described above, the slag particles in the semi-melt state immediately after granulation are brought into contact with the cooling gas vortex flow which rotates at a high speed in the apparatus body, thereby rapidly realizing the rapid cooling of the slag, It is to improve the unit cooling efficiency.

In particular, the present invention forcibly increases the contact residence time between the particle slag and the rotary flow cooling gas (air), thereby making it possible to effectively recover the heat retained by the particle slag even with a small amount of the cooling gas.

As a result, it is possible not only to improve the treatment operability of molten slag or the quality (strength) of the treated slag particles, but also to provide efficient energy recovery by providing efficient heat recovery in the slag treatment process.

1 is a configuration diagram showing the overall configuration of the molten slag dry granulation apparatus according to the present invention
Figure 2 is a schematic plan view of the device of the invention of Figure 1
3 is a main view showing another modification of the apparatus of the present invention of FIG.

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

First, in FIG. 1 and FIG. 2, the whole structure of the slag dry processing apparatus 1 which concerns on this invention is shown with a block diagram and a schematic plan view.

That is, as shown in Figures 1 and 2, the slag dry processing apparatus 1 of the present invention is largely so that the apparatus main body 10 and the molten slag 30 injected into the apparatus main body to be granulated while colliding and scattered. A slag impingement rotating body 50 provided, and a rotational flow coolant gas forming means 70 provided to form a slag impingement rotation body 50 passing through the apparatus main body 10 and contacting the slag particles to be discharged externally. It may be configured as an embodiment including.

Therefore, the present invention will be described in detail below, but along the side wall of the rotational flow cooling gas G, that is, supplied to the inside of the apparatus body 10 through the rotational flow cooling gas forming means 70. Since the cooling gas G is supplied to the apparatus main body 10 with the residence time possible within the apparatus main body while turning, the molten slag 30 which is introduced into the apparatus main body to the slag collision rotating body 50 and falls down. ) Is collided and scattered to the side wall of the apparatus main body to achieve rapid cooling by the rotational flow cooling gas (G).

That is, the rotational flow cooling gas G that is pivoted inside the main body of the apparatus has a sufficient retention time and collides with the possible scattering slag in the main body of the apparatus while the heat is transferred from the high temperature slag to recover the heat. And the high temperature heat recovery close to the temperature of the particle slag 30 '.

In particular, the slag particles 30 ′ that are dropped and scattered by the slag collision rotating body 50 are rapidly cooled through sufficient cooling gas contact, and high quality slag particles are discharged from the apparatus body.

In this case, as shown in Figures 1 and 2, the apparatus main body 10 is preferably provided as a conical shape of the upper and lower light as a whole, for example, between the inclined portion (10a) (10b) of the inner and outer edges therebetween. It consists of a side wall (10c) and a bottom (10d) for connecting the slag inlet 12 which is opened in the upper center of the apparatus main body and the molten slag 30 falls from the slag tundish 32 is provided In addition, the bottom 10d side further includes a discharge port 14 for simultaneous discharge of hot gas G 'that is heat-transmitted by contacting the slag particles while being rotated and rotated after being injected with the slag particles 30' cooled after scattering. .

Meanwhile, as shown in the main part of FIG. 1, the apparatus body 10 has a double structure, and a cooling water pipe 11 is provided therein to implement cooling of the apparatus body itself, and the slag particles 30 ′ scattered collide with each other. In this case, the slag particles can be cooled more smoothly.

At this time, the slag collision rotating body 50 is a disk made of a heat-resistant material, the drive motor 52 connected to the bearing block 52a installed in the center where the internal combustion inclined portion 10a of the apparatus body is axially connected, 1 and 2, the slag collision rotating body 50 is preferably disposed directly below the central slag inlet 12 of the apparatus main body 10.

On the other hand, more preferably, the slag collision rotating body 50 is to have a curved surface 50a having a concave in the center, as shown in the main portion in FIG.

The curved surface of the rotating body guides the scattering direction of the slag to the upper side of the outer edge inclined portion 10b of the apparatus body 10 so that the slag particles 30 'stay in the apparatus body for a long time and come into contact with the cooling gas. something to do.

At this time, as shown in Figures 1 and 2, of the inner and outer edge inclined portions (10a, 10b) of the apparatus body 10, particularly the outer edge inclined portion (10b) is the flow of the rotational flow supply cooling gas (G) It will be possible to rotate in stages along the body of the apparatus, thereby enabling the rotational flow contact of the slag and the cooling gas.

Next, while allowing the formation of slag particles through slag cooling in the apparatus of the present invention, the rotary flow cooling gas forming means 70 of the present invention, in particular, allows the cooling gas G to pass through the inside of the apparatus body in a pivoting state. It is provided on the apparatus main body 10, the external cooling gas supply pipe 72 is connected, the lower portion of the annular ring-shaped cooling gas tangential supply chamber 74 is formed with an opening 76 communicating with the inside of the apparatus body. ).

Thus, as shown in Figures 1 and 2, the cooling gas 30, for example, the air supplied during the operation of the blow 78 associated with the cooling gas supply pipe 72, for example, the air supply ring 74 of the annular ring form It is supplied in a tangential direction from one side of, the cooling gas (G) is discharged to the outlet 14 of the lower side through the device body while turning along the outer periphery inclined portion (10b) of the device body (10).

Of course, the slag particles 30 ′ collided with the rotating body when the device passes through the apparatus body in contact with the rotating body come into contact with each other, thereby cooling the slag particles in the molten state with a residence time.

For example, as shown in FIG. 2, scattered with respect to the rotational flow cooling gas G passing through the supply chamber 74 in the upper part of the apparatus body at least along the outer periphery slope 10b. The slag particles 30 'are vertically scattered in the rotor as shown by the arrow in FIG. 2, and are subjected to centrifugal force by the momentum of the rotational flow cooling gas G to generate a tangential velocity component.

Therefore, since the slag particles 30 'contact with the rotary flow cooling gas G at right angles thereto, the relative speed is secured, and the heat transfer effect between the slag particles 30' and the rotary flow cooling gas G is increased. Will be.

Subsequently, the slag particles 30 'are subjected to centrifugal force by the rotary flow cooling gas G3 along the outer periphery inclination portion 10b of the apparatus main body, so that the slag particles 30' do not immediately fall within the apparatus main body like the cooling gas flow. Because of this, the residence time of the slag particles in the apparatus body is increased by that much.

To this end, the cooling gas supply pipe 72 is required to be connected to the ring-shaped supply chamber 74 in the circumferential direction as shown in FIG.

In addition, the guide plate 74a for allowing the cooling gas discharged from the chamber to be discharged to the outer edge inclined portion 10b side of the apparatus main body in the lower opening 76 of the cooling chamber 74 to facilitate the formation of rotation in the apparatus main body. ) May be further provided.

At this time, preferably the cooling gas (G) may be provided as air or carbon dioxide, carbon dioxide will be able to ensure the slag particle strength by reacting with the slag.

On the other hand, more preferably, as shown in Figure 1, in the apparatus of the present invention is to further connect the mist (droplet) supply means 110 to the cooling gas supply pipe 72, the mist supply means (generator) 110 Mist generated in the) is injected into the cooling gas supply pipe 72 according to the opening and closing of the valve (V), the mist (M) is injected into the mist (M) in contact with the hot slag particles more smoothly slag cooling. something to do.

At this time, since the mist is in the state of fine water particles containing water, the slag is not directly cooled as water or water, so that cracks (cracks) in the slag particles due to conventional water or water chains do not occur.

On the other hand, as shown in Fig. 1, Preferably, the outlet 14 (discharge duct) of the apparatus main body, the hopper 16 for accommodating the dry-cooled slag particles 30 'and discharged outwards is linked. .

The lower portion of the hopper 16 is provided with a gate (16a) can be discharged to the treated slag 30 "to the discharging trolley (16b).

On the other hand, as shown in Figure 1, the upper portion of the hopper 16, as described above, the high temperature gas treatment for the treatment of the high temperature gas (G ') in contact with the hot slag to recover (containing) the thermal energy The means 90 is to be linked.

That is, the high temperature gas is discharged to an external storage tank (not shown) by the blowing operation in connection with the blowing 92, and the screen 94 is disposed at the blowing connection portion so that the slag particles 30 'are discharged to the outside. It is desirable to block the work.

Next, Fig. 3 shows another modification of the apparatus of the present invention.

That is, as shown in Figure 3, the apparatus of the present invention is provided in the outer edge inclined portion (10b) of the apparatus main body 10, the cooling gas rotation guide means for forcibly guiding the cooling gas rotational flow in a multi-layer ( 18) is further provided.

That is, the cooling gas rotation guide means 18 may be formed along the outer periphery slope of the apparatus main body in the form of a screw formed along the outer periphery inclined portion 10b of the apparatus main body.

Therefore, when the supplied cooling gas passes through the device body primarily along the outer periphery slope of the device body through the opening 76 of the supply chamber 74, the rotation guide means 18 of the screw zone is cooled gas. Since the gas flows through the apparatus body with a constant residence time while forming a rotational air flow that is forced to turn more stably, sufficient cooling (quenching) of the slag and the residence time of the slag particles in the apparatus body are increased.

For example, as shown in FIG. 3, the apparatus 1 of the present invention is provided at least in the rotation guide portion of the outer edge inclination portion 10b of the apparatus body 10 and the screw-shaped cooling gas rotation guide means 18. Cooling gas turbulence generating means 20 may be further included.

At this time, the turbulence generating means 20, as shown in Figure 3, may be provided as a triangular pyramid (20a) or a rod (20b) provided at a predetermined interval to the device body by a screw fastening method.

Thus, the turbulence generating means forcibly forms a cooling gas turbulence around it while the cooling gas is turning and colliding, so that the slag particles are sufficiently brought into contact cooling with the cooling gas, thus making the slag rapid cooling more smooth. will be.

Moreover, the turbulence generating means 20 of the present invention will also provide another advantage that effectively suppresses the conventional problem of adhering slag particles in a semi-fused state that is scattered.

On the other hand, as shown in Figure 1, in the apparatus of the present invention, the hot gas (G ') discharge pipe 96 is discharged to the hopper 16 where the treated slag particles 30 "of the discharged atmosphere is collected, respectively. It is also preferable to install temperature sensors 130 and 130 ′ for detecting high temperature gas and slag temperature, and to associate them with the device control unit C.

In addition, the apparatus control unit C associated with the sensors includes a blowing 78 of the rotational flow cooling gas forming unit 70, a motor 52 for driving the slag collision rotating body 50, and a high temperature gas. Blowing 92 of the processing means 90, and the crane 34 associated with the slag tundish 32 to determine the device body dose of the slag can be associated.

For example, in the case of the device of the present invention, as shown in Figure 1, the temperature of the slag (30 ") or the temperature of the hot gas (G) discharged from the hopper is sensed through the temperature sensors 130, 130 ', the temperature Is excessively low or high outside the set temperature range, the device control unit controls the slag device input of the tundish through the crane and associated blows and rotor speed, respectively, or decreases or increases the amount of cooling gas supplied to release slag. It is possible to control the temperature or the temperature of the hot gas to be recovered or the amount of hot gas generated.

On the other hand, if the slag treatment step of the present invention through the slag dry treatment apparatus 1 of the present invention described above is briefly summarized, the molten slag 30 introduced first is collided with the rotating body 50 to set the space, for example, Flying slag 30 impinged into the slag particles 30 'in the apparatus body 10, and rapidly cooling and heat recovery of the semi-fused slag particles through contact with the scattered slag particles. Supplying the cooling gas (G) to the apparatus body.

At this time, preferably, as shown in Figure 1, the set space, that is, the slag particles 30 'and the high temperature gas (G') discharged to the hopper 16 from the apparatus body 10 hopper 16 The separation process further comprises.

In this case, the external discharging of the treated slag particles 30 'and the external recycling of the hot gas G' will be facilitated.

While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

1 .... slag dry processing device 10 .... device body
12 .... slag inlet 14 .... outlet
16 .... Hopper 18 .... Cooling gas rotation guide means
20 .... Means of turbulence 30 .... Molten slag
30 '.... slag particles 32 .... slag tundish
50 .... slag impact rotor 52 .... motor
70 .... Means for forming a circulating coolant gas 72 .... Cooling gas supply pipe
74 .... Cooling gas supply chamber 76 .... Chamber opening
90. High temperature gas treatment means 94 .... screen
110 .... Mist supply means 130,130 '.... Temperature sensor

Claims (11)

Device body 10;
A slag impingement rotating body (50) provided in the apparatus main body so as to allow collision scattering of molten slag (30) to be injected; And,
A rotational flow coolant gas forming means (70) provided to the apparatus main body (10) to provide cooling gas rotational flow through which the slag cooling and heat transfer pass through the apparatus body;
Slag dry processing device configured to include. The method of claim 1,
The apparatus main body 10 is a slag inlet 12 is disposed in the upper and lower sides for the internal input of the molten slag 30, and the device discharge of the slag particles (30 ') and the heat recovery hot gas (G'). And an outlet 14,
The slag collision rotating body (50), the slag dry processing apparatus, characterized in that it is disposed directly below the slag inlet (12) while being associated with the drive motor (52) associated with the apparatus main body. The method of claim 2,
In the outlet 14 of the apparatus main body, a hopper 16 which receives the cooled slag particles 30 " and externally discharges the hopper 16, is connected, and the upper part of the hopper is configured to process the heat-recovered hot gas G '. Slag dry processing apparatus, characterized in that the hot gas processing means 90 is further provided. 4. The method according to any one of claims 1 to 3,
The rotational flow coolant gas forming means (70) is provided on the apparatus main body and connected to the cooling gas supply pipe (72), and supplies the supplied cooling gas (G) in the tangential direction of the device body to form the rotational airflow. A slag dry processing apparatus comprising the provided rotational flow coolant gas supply chamber (74). The method of claim 4, wherein
The cooling gas supply chamber 74 has an opening 76 which is provided at the outer edge of the slag inlet 12 provided in the apparatus body and communicates with the inside of the apparatus body, and the cooling gas supply pipe 72 is circumferentially directed. Slag dry processing apparatus, characterized in that connected to. The method of claim 4, wherein
Cooling gas (G) supplied through the cooling gas supply pipe 72 is composed of air or carbon dioxide,
Slag dry treatment apparatus, characterized in that the mist supply means 110 is further connected to the cooling gas supply pipe (72). The method of claim 4, wherein
The apparatus main body (10), the slag dry processing apparatus further comprises at least an outer edge inclined portion of the inner and outer edge inclined portion (10a, 10b) flowing along the cooling gas rotational flow. The method of claim 7, wherein
Cooling gas rotating guide means (18) provided on at least an outer edge inclined portion of the apparatus main body to guide cooling gas rotating flow; And,
Cooling gas turbulence generating means (20) provided in at least the rotation guide means of the outer edge inclined portion and the rotation guide means;
Dry slag treatment apparatus further comprises any one or both of them. The apparatus of claim 4, further comprising at least one of a hot gas (G ') discharged from the apparatus body and a hot gas and slag temperature sensor (130, 130') provided to sense the temperature of the treated slag particles. and,
The apparatus control unit (C) associated with the sensor is connected to the blowing gas of the cooling gas forming means, the motor of the slag collision rotating body, the blowing of the hot gas processing means, and the slag tundish is linked to the temperature of the processed slag or hot gas Slag dry processing apparatus, characterized in that configured to control. Impinging the injected molten slag into the rotating body and scattering it into slag particles in a set space; And,
Supplying a rotary flow cooling gas in the setting space to enable rapid cooling and heat recovery of the semi-fused slag particles through contact with the scattered slag particles;
Slag dry treatment method configured to include. The method of claim 10,
The slag dry treatment method further comprises the step of separating and processing the slag particles and the hot gas discharged from the set space.

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