KR101036912B1 - Hot slag cooling apparatus - Google Patents

Hot slag cooling apparatus Download PDF

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Publication number
KR101036912B1
KR101036912B1 KR1020080090719A KR20080090719A KR101036912B1 KR 101036912 B1 KR101036912 B1 KR 101036912B1 KR 1020080090719 A KR1020080090719 A KR 1020080090719A KR 20080090719 A KR20080090719 A KR 20080090719A KR 101036912 B1 KR101036912 B1 KR 101036912B1
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KR
South Korea
Prior art keywords
slag
cooling
unit
rotating
cooling fluid
Prior art date
Application number
KR1020080090719A
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Korean (ko)
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KR20100031875A (en
Inventor
박흥수
Original Assignee
재단법인 포항산업과학연구원
주식회사 포스코
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Priority to KR1020080090719A priority Critical patent/KR101036912B1/en
Publication of KR20100031875A publication Critical patent/KR20100031875A/en
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Publication of KR101036912B1 publication Critical patent/KR101036912B1/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/052—Apparatus features including rotating parts
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/052—Apparatus features including rotating parts
    • C21B2400/054—Disc-shaped or conical parts for cooling, dispersing or atomising of molten slag rotating along vertical axis
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/052—Apparatus features including rotating parts
    • C21B2400/056—Drums whereby slag is poured on or in between
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2

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  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Details (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)

Abstract

The molten slag cooling apparatus of the present invention is installed at a position in which the slag is contained and the radially sprayed film form by the rotation of the rotating portion to convert the slag into a droplet state by collision with the slag in the form of film, and converts Rotating drum unit to rotate in one direction to eject the slag of the droplet state to the lower side, and a cooling fluid injector for solidifying the slag of the droplet state by injecting a fluid to the slag of the droplet state is installed below the rotary drum portion and ejected do.

The invention as described above can increase the distribution density of the droplets to increase the surface area of the slag by applying two levels of mechanical energy to the molten slag, thereby facilitating heat transfer to increase the cooling efficiency. .

Slag, rotating part, rotating drum part, cooling fluid jet part, cooling

Description

Molten Slag Cooler {HOT SLAG COOLING APPARATUS}

The present invention relates to a molten slag cooling device, and more particularly to a molten slag cooling device for increasing the cooling efficiency of the slag.

In general, the molten slag generated during the molten iron preliminary treatment in the blast furnace and the converter of the steel mill is usually a high temperature of more than 1000 degrees, such slag is cooled by using water or left in the air, and the cooled slag is cement fine aggregate, fertilizer, etc. It can be used as a resource in a landfill or treated as a landfill.

Conventionally, as shown in Figure 1, using a rotary cup 10 containing the slag (S) to radially eject the slag (S), and then impinge on the cooling wall 20 or as shown in FIG. Likewise, the slag S is dropped on the rotating cup 10 and the rotating drum 30 arranged horizontally to cool the slag S.

However, such a method cannot add sufficient mechanical energy in response to a situation in which the physical and chemical properties of the supplied slag S are changed, such as when the viscosity of the slag S is increased or the temperature is low. Slag wool in the shape or fine droplets are not formed.

In particular, in the method of cooling the slag S by using the rotating drum 30, a problem occurs in that the slag S dropped on the rotating drum 30 moves to the side wall and leaks or is fixed to the rotating drum 30. .

In addition, the slag (S) is the properties of the slag (S) according to the cooling rate is different, and in general, the faster the cooling rate, the higher the value as a resource. Water or air is used as the cooling solvent for this purpose, but since mechanical energy is not added to the slag, a problem that requires a large amount of water occurs. In addition, since water is difficult to raise the temperature to 100 degrees or more, a problem arises that it is difficult to recover the heat of the slag S and reuse it.

In addition, since the slag (S) contains about 10 to 15% of CaO alone phase, the chemical reaction proceeds as time passes in the cooled state, which causes the volume to expand in the state of being used or buried as a subgrade material. Problems such as this occur.

In order to solve the above problems, an object of the present invention is to provide a molten slag cooling apparatus for increasing the heat recovery rate while increasing the cooling efficiency of the slag.

Moreover, an object of this invention is to provide the molten slag cooling apparatus for reducing the content of the CaO single phase contained in slag.

In order to achieve the above object, the molten slag cooling apparatus of the present invention is installed in a position in which the slag is contained, and the radially sprayed in the form of a film by the rotation of the rotating part slag by the collision with the slag of the film form Is converted into a droplet state, and the slag of the droplet state by spraying a fluid on the rotating drum portion rotated in one direction so that the slag of the converted droplet state is ejected downward, and the slag of the droplet state is provided below the rotary drum portion A cooling fluid injection unit for coagulating the discharge fluid is further provided below the cooling fluid injection unit for discharging the solidified slag, between the cooling fluid injection unit and the discharge unit recovers the water vapor converted from the fluid injected into the slag A recovery part is provided further.

The cooling fluid injector may spray carbon dioxide in a liquid or gaseous state onto slag in a droplet state.

The cooling fluid injection unit may inject water to the slag in the droplet state.

The rotating drum portion may be composed of a rotating drum having a circular cross section and a protrusion formed on the surface of the rotating drum.

delete

In the present invention, by applying two-stage mechanical energy to the slag, it is possible to increase the distribution density of the droplets to increase the surface area of the slag, thereby facilitating heat transfer to increase the cooling efficiency.

In addition, by using carbon dioxide as the cooling fluid, the present invention has the effect of removing the CaO alone phase contained in the slag and at the same time maintaining the carbon dioxide to increase the cooling efficiency.

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

3 is a cross-sectional view showing a molten slag cooling apparatus according to the present invention, Figures 4 and 5 is a schematic cross-sectional view showing the operation of the molten slag cooling apparatus according to the present invention.

Referring to FIG. 3, the molten slag cooling apparatus according to the present invention includes a housing 600, a rotating part 100 provided in the housing 600, and a rotating drum part 200 provided on one side of the rotating part 100. And, the cooling fluid injection unit 300 provided in the lower portion of the rotary drum unit 200, the discharge unit 400 provided in the lower portion of the cooling fluid injection unit 300, the discharge unit 400 and the cooling fluid It includes a recovery unit 500 provided between the injection unit 300.

The housing 600 is formed in a cylindrical or rectangular box shape having a center penetrating up and down, and a predetermined space is provided therein.

In the interior of the housing 600, specifically, the inner part of the housing 600 in which the center of the housing 600 is vertically penetrated is provided with the rotating part 100, and the rotating part 100 has a groove formed toward the inner side thereof. To form a cup, whereby slag may be stored on the upper portion of the rotating part 100. In addition, the lower portion of the rotating part 100 is mounted with a driving unit 110, such as a motor for rotating the rotating unit 100, the driving unit 110 may rotate the rotating unit 100 about the vertical axis.

Specifically, the upper part of the rotating part 100, the upper part in the housing 600 is provided with a rotating drum 200 for applying mechanical force to the slag in the form of film radiated from the rotating part 100, such a rotating drum part 200 includes a rotating drum 210 and a protrusion 220 formed on the surface of the rotating drum 210.

The rotating drum 210 may be formed in a circular cross section, and may be installed at a position where the slag contained in the rotating part 100 is radiated by the rotating part 100. Here, the rotating drum 210 may be formed of one rotating drum 210 to form a closed curve, it may be divided into a plurality formed.

Protrusion 220 is formed on the surface of the rotary drum 210 toward the outside of the rotary drum 210, the protrusion 220 is applied to the impact of the film-type slag sprayed on the surface of the rotary drum 210 By applying mechanical energy, the slag in film form can be easily changed to slag in droplet form.

In addition, the protrusion 220 may prevent the slag sprayed on the surface of the rotating drum 210 from being fixed to the rotating drum 210, and the slag sprayed on the surface of the rotating drum 210 may rotate. It can also play a role in guiding down. The shape of the protrusion 220 formed on the surface of the rotary drum 210 is not limited, and may be formed in various shapes such as hemispheres, polygonal pillars, polygonal horns, and the like.

Here, some walls of the housing 600 located between the rotating part 100 and the rotating drum part 200 may be formed to be cut so that the rotating drum part 200 may collide with the slag radiated from the rotating part 100. have.

Below the rotating drum unit 200 is provided with a cooling fluid injection unit 300 for cooling the slag which is changed into the droplet state from the rotating drum unit 200 and ejected downward, the cooling fluid injection unit 300 is a droplet A plurality may be arranged to be spaced horizontally and vertically along a path along which the slag of the state moves.

Here, the cooling fluid injection unit 300 may be solidified by cooling the slag by spraying water, it may be solidified by cooling the slag by spraying carbon dioxide in the liquid or gas state.

As described above, the discharge unit 400 may be formed at the lower side of the side of the housing 600 to discharge the cooled and solidified slag. The discharge unit 400 may be formed as one along the lower side of the housing 600, it may be divided into a plurality formed.

Although the discharge part 400 is formed below the side surface of the housing 600, the present invention is not limited thereto, and the discharge part 400 may be formed on the lower surface of the housing 600. Here, the wall of the inner space of the housing 600 may be inclined toward the discharge unit 400 so as to smoothly discharge the solidified slag to the discharge unit 400.

A recovery unit 500 is further provided between the discharge unit 400 and the cooling fluid injection unit 300 to recover the high temperature water vapor converted from the fluid injected into the slag from the cooling fluid injection unit 300. The recovery part 500 may be formed on the side surface of the housing 600, and may be preferably spaced apart from the upper portion of the discharge part 400 formed on the lower side of the housing 600. The recovery unit 500 as described above serves to recover the high temperature steam after being injected into the slag, and thus the recovered steam can be reused in other industrial fields.

Hereinafter, with reference to Figures 4 and 5, the operation of the molten slag cooling apparatus according to the present invention.

As shown in FIG. 4, when the slag S is dropped from the separate injection device and stored in the rotating unit 100, the rotating unit 100 starts to rotate by the driving unit 110 connected to the rotating unit 100. The slag S contained in the upper portion of the rotating part 100 is radially injected toward the outside of the rotating part 100 by centrifugal force by the rotation of the rotating part 100, and the injected slag S has a film shape having a predetermined surface area. It is formed as a primary mechanical force.

Subsequently, the slag S in the form of a film injected from the rotating part 100 collides with the rotating drum part 200 rotating toward the rotating part 100, specifically, the protrusion 220 formed in the rotating drum part 200. Collision, which causes a secondary mechanical force on the slag (S).

Subsequently, the slag S subjected to the force of the two stages is ejected by changing the direction downward of the rotating drum 200 while changing from the rotating drum 200 to the droplet state.

Subsequently, as shown in FIG. 5, the slag S ejected downward of the rotating drum 200 is cooled and solidified while passing through the cooling fluid injection unit 300, and gas-reacts with the cooling fluid. .

For example, when water is injected into the slag (S) from the cooling fluid injection unit 300, the CaO alone phase contained in the slag (S) in addition to the cooling effect is removed by Scheme 1.

In addition, when the liquid or gaseous carbon dioxide is injected into the slag (S) from the cooling fluid injection unit 300, in addition to the cooling effect, the CaO alone phase is removed by the reaction formula 1, and at the same time the effect of fixing the carbon dioxide There is. This has the effect of improving the cooling efficiency of the slag (S) by fixing the carbon dioxide as a cooling medium.

Subsequently, the cooled and solidified slag S is discharged to the outside through the discharge unit 400. On the other hand, the water vapor after the heat exchange with the injected fluid to cool the slag (S) is recovered by the recovery unit 500, the recovered water vapor is used as a heat energy source of power generation, steam production or other uses in the present invention Finish the operation of the slag cooler according to.

As described above, the slag treated by the slag cooling device according to the present invention receives mechanical energy in two stages by the rotating part and the rotating drum part, so that the viscosity of the slag increases or the ability to cope with temperature changes or supply fluctuations. It can be ensured, the production of finer slag droplets is possible, and the distribution density of slag droplets can be made high.

Here, the increase in the surface area and the increase in the distribution density of the droplets mean an increase in the surface area of the slag droplets per unit volume, thereby facilitating heat transfer and reducing the mass of the cooling medium, thereby recovering heat at a higher temperature. That is, when water is used as a cooling medium, cooling is possible by a small amount of spray, so that the amount of cooling can be minimized, and at the same time, high temperature steam can be obtained.

In the case of inducing a gas reaction with the surface of the slag droplets, the reaction rate is increased by increasing the surface area as described above, and there is an effect of increasing the mass of the molten slag participating in the reaction. That is, when the molten slag is cooled using carbon dioxide and at the same time inducing a reaction with the CaO alone phase, the CaO alone phase can be removed from the molten slag, and the cooling efficiency can be increased due to the fixation of carbon dioxide.

Although described above with reference to the drawings and embodiments, those skilled in the art that the present invention can be variously modified and changed within the scope without departing from the spirit of the invention described in the claims below I can understand.

1 and 2 is a cross-sectional view showing a conventional molten slag cooling device.

3 is a cross-sectional view showing a molten slag cooling apparatus according to the present invention.

4 and 5 are cross-sectional views showing the operating state of the molten slag cooling apparatus according to the present invention.

               <Description of the code | symbol about the principal part of drawings>

100: rotating unit 110: driving unit

210: rotating drum 220: projection

300: cooling fluid injection unit 400: discharge unit

500: recovery part 600: housing

Claims (5)

The slag (S) is contained in the rotary part 100 and the radially sprayed position in the film form by the rotation of the rotating part 100 is installed to the slag (S) by the collision with the slag (S) in the form of film droplets A slag in the state of being converted into a state and installed in the spray drum portion 200 which is rotated in one direction so that the slag S in the converted droplet state is ejected downward, and ejected below the rotating drum portion 200 ( Injecting a fluid to S) comprises a cooling fluid injection unit 300 for solidifying the slag (S) in the droplet state, A discharge unit 400 for discharging the solidified slag S is further provided below the cooling fluid injection unit 300, and the slag S is disposed between the cooling fluid injection unit 300 and the discharge unit 400. Melting slag cooling device characterized in that the recovery unit 500 for recovering the converted steam from the fluid injected into the further provided. The method according to claim 1, The cooling fluid injection unit 300 is molten slag cooling apparatus, characterized in that for injecting carbon dioxide in the liquid or gas state to the slag (S) in the droplet state. The method according to claim 1, The cooling fluid injection unit 300 is molten slag cooling apparatus, characterized in that for spraying water to the slag (S) in the droplet state. The method according to claim 1, The rotary drum unit 200 is a molten slag cooling device, characterized in that consisting of a rotary drum 210 having a circular cross section, and a protrusion 220 formed on the surface of the rotary drum 210. delete
KR1020080090719A 2008-09-16 2008-09-16 Hot slag cooling apparatus KR101036912B1 (en)

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KR1020080090719A KR101036912B1 (en) 2008-09-16 2008-09-16 Hot slag cooling apparatus

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KR101036912B1 true KR101036912B1 (en) 2011-05-26

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101173498B1 (en) * 2010-12-28 2012-08-14 재단법인 포항산업과학연구원 Apparatus for granulation and sensible heat collection of melting slag
DE102011117599B3 (en) 2011-11-04 2013-01-17 Wolfgang Beyer Process for the integration and use of environmentally harmful carbon dioxide

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005082454A (en) 2003-09-09 2005-03-31 Central Res Inst Of Electric Power Ind Granulating method of molten slag and granulating device of molten slag
KR100558310B1 (en) 2003-12-22 2006-03-10 재단법인 포항산업과학연구원 An Apparatus and A Method for dry cooling of molten pretreatment slag
JP2007284263A (en) * 2006-04-12 2007-11-01 Nippon Steel Corp Method and apparatus for treating molten blast furnace slag

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005082454A (en) 2003-09-09 2005-03-31 Central Res Inst Of Electric Power Ind Granulating method of molten slag and granulating device of molten slag
KR100558310B1 (en) 2003-12-22 2006-03-10 재단법인 포항산업과학연구원 An Apparatus and A Method for dry cooling of molten pretreatment slag
JP2007284263A (en) * 2006-04-12 2007-11-01 Nippon Steel Corp Method and apparatus for treating molten blast furnace slag

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