KR20120033086A - Method and apparatus for cooling of slag - Google Patents

Method and apparatus for cooling of slag Download PDF

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Publication number
KR20120033086A
KR20120033086A KR1020100094685A KR20100094685A KR20120033086A KR 20120033086 A KR20120033086 A KR 20120033086A KR 1020100094685 A KR1020100094685 A KR 1020100094685A KR 20100094685 A KR20100094685 A KR 20100094685A KR 20120033086 A KR20120033086 A KR 20120033086A
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KR
South Korea
Prior art keywords
cooling
blast furnace
furnace slag
cooling tower
pipe
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Application number
KR1020100094685A
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Korean (ko)
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KR101193693B1 (en
Inventor
박병철
임홍섭
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현대제철 주식회사
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Priority to KR1020100094685A priority Critical patent/KR101193693B1/en
Publication of KR20120033086A publication Critical patent/KR20120033086A/en
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Publication of KR101193693B1 publication Critical patent/KR101193693B1/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2200/00—Recycling of non-gaseous waste material
    • 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
    • C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
    • 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
    • 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
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/072—Tanks to collect the slag, e.g. water tank
    • 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
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/074—Tower structures for cooling, being confined but not sealed
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)

Abstract

The present invention relates to a method and apparatus for cooling a slag, wherein a blast furnace slag in a molten state is supplied to a cooling tower (20) through two pipes having respective supply ports (21, 23) and a high pressure in the cooling tower (20). Water is sprayed to cool the blast furnace slag.
The present invention can reduce the amount of high pressure water injected during cooling of the blast furnace slag, and can also reduce the amount of water injected for dust removal, and can also reduce the amount of water injected for dust removal generated during cooling of the blast furnace slag. There is an advantage.

Description

Slag cooling method and apparatus {Method and apparatus for cooling of slag}

The present invention relates to a slag cooling method and apparatus, and more particularly, to a slag cooling method and apparatus for cooling the blast furnace slag to form a slag made of water.

Slag refers to a solvent, a nonmetallic substance, a metal oxide, etc., which floats or remains on waste water when melting iron ore or scrap in a furnace, an electric furnace, or the like.

The slag floats on the surface of the molten steel during melting of the raw material, thereby preventing the molten steel surface from being oxidized by air and preserving the surface thereof.

SUMMARY OF THE INVENTION An object of the present invention is to provide a slag cooling method and apparatus for reducing the amount of high pressure water injected during cooling of blast furnace slag and utilizing hot air and hot steam generated during cooling of blast furnace slag.

According to a feature of the present invention for achieving the above object, the present invention is to supply the blast furnace slag in the molten state to the cooling tower through two pipes and to spray the high pressure water in the cooling tower to cool the blast furnace slag. .

Cooling air is injected into at least one of the two pipes so that the blast furnace slag is first cooled before being fed to the cooling tower.

Water is injected into the cooling tower to remove dust generated during cooling of the blast furnace slag.

The hot steam and hot air generated during cooling of the blast furnace slag are recovered and used for producing hot water.

Cooling tower; First and second pipes connected to one side of the cooling tower and supplying blast furnace slag into the cooling tower; And a cooling water injection nozzle installed at an adjacent portion of the first pipe and the second pipe to spray high pressure water into the cooling tower to cool the blast furnace slag.

The first pipe or the second pipe is made of a structure of the vertical pipe and the inclined pipe,

The inclined pipe is formed in a shape inclined from the bottom to the top, and a cooling air injecting portion for injecting cooling air into the inclined pipe is formed in the inclined lower portion.

The cooling tower is provided with a water spray member for spraying water for dust removal generated during cooling of the blast furnace slag.

The upper part of the cooling tower is provided with a discharge pipe for discharging the hot steam and hot air generated during the cooling of the blast furnace slag, the heat exchanger for recovering the heat of the hot steam and hot air in the discharge pipe to produce hot water To place.

The present invention supplies the blast furnace slag to the cooling tower through two pipes having respective supply ports, and injects cooling air into at least one of the two pipes so that the blast furnace slag is first cooled before being supplied to the cooling tower. . Therefore, it is possible to reduce the amount of high pressure water injected during cooling of the blast furnace slag, and also to reduce the amount of water injected for dust removal.

In addition, the present invention recovers the hot steam and hot air generated during the cooling of the blast furnace slag is used in the production of hot water. Therefore, there is an effect that can recycle the heat.

1 is a block diagram showing a slag cooling method according to the present invention.
Figure 2 is a schematic view showing a slag cooling apparatus according to the present invention.

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

In the slag cooling method according to the present invention, the blast furnace slag in the molten state separated from the molten iron in the blast furnace is supplied to the cooling tower through the two pipes and the high pressure water is injected into the cooling tower. In this process, at least one of the two pipes is injected with cooling air to cool the blast furnace slag first before being supplied to the cooling tower.

The primary cooling by cooling air injection is to lower the temperature of the blast furnace slag to some degree and to supply it into the cooling tower. By supplying blast furnace slag with a lower temperature as it passes through the pipe to the cooling tower, the injection volume of high pressure water can be reduced.

The blast furnace slag separated from the molten iron in the blast furnace is a high temperature of 1500 ℃ or more, so the amount of high pressure water used when cooling the whole amount with high pressure water is considerable. Therefore, the blast furnace slag is divided into two pipes and supplied to the cooling tower, and one of the two pipes is injected into the cooling air to be cooled first and then supplied to the cooling tower. Cooling air is air at room temperature.

The blast furnace slag supplied to each cooling tower through the two pipes is cooled by the high pressure water injected into the cooling tower and floated in a solid state in water accumulated under the cooling tower. The blast furnace slag also cools during this process.

Water and blast furnace slag accumulated in the lower part of the cooling tower are transferred to the storage hopper, water is discharged to the lower portion of the storage hopper, and the blast furnace slag is collected and supplied as a raw material of cement.

Water is injected into the cooling tower to remove dust generated during cooling of the blast furnace slag. Water to remove dust is sprayed in the form of a spray. Water for dust removal can be sprayed as needed.

Hot steam and hot air generated during the cooling of blast furnace slag are recovered and used for producing hot water. The content of blast furnace slag is about 300 kcal / ton, which is about 372,000 kcal / year annually. The annual value of blast furnace slag in terms of LNG gas calorific value is 3,899,371Nm3 / year, and the recovery value is sufficient. Hot water production uses a heat exchanger.

The water discharged to the lower part of the storage hopper is cooled through a cooling bank and then supplied to the cooling tower as water or high pressure water for dust removal.

As shown in FIGS. 1 and 2, the slag cooling device includes a cooling pipe 20 and a first pipe and a second pipe connected to one side of the cooling tower 20 to supply blast furnace slag into the cooling tower 20. And a coolant injection nozzle installed at adjacent portions of the first pipe and the second pipe to inject the high pressure water into the cooling tower.

The blast furnace slag supplied into the cooling tower 20 is a slag in a molten state separated from the molten iron in the blast furnace 10.

Cooling tower 20 is installed in the first and second supply port 21, 23 and the cooling water injection nozzle 50 is connected to the first pipe 30 and the second pipe 40 on one side ( 25), the lower portion is provided with a transfer pipe 27 to be connected to the storage hopper (80). A transfer pump 28 is disposed in the transfer pipe 27 so that water (W) and blast furnace slag (S) accumulated in the lower portion of the cooling tower 20 can be transferred to the storage hopper 80. Water and blast furnace slag transferred from the storage hopper 80 are separated.

The first pipe 30 or the second pipe 40 has a structure of a vertical pipe and a sloped pipe.

In this embodiment, the second pipe 40 has a structure of the vertical pipe 41 and the inclined pipe 43, 45.

The first pipe 30 is connected to the cooling tower 20 in a straight pipe structure so that the blast furnace slag in the molten state is directly supplied into the cooling tower 20, and the second pipe 40 is connected to the cooling tower 20. The blast furnace slag is fed to the cooling tower via the vertical pipe 41 and the inclined pipes 43 and 45 by connecting the structure of the vertical pipe and the inclined pipe.

The inclined pipes 43 and 45 are formed to be inclined from the bottom to the upper side in the cooling tower 20 direction, and the cooling air injection unit 43a injects cooling air into the inclined pipes 43 and 45 to the inclined bottom. 45a). Inclined pipes 43 and 45 secure the residence time of the blast furnace slag in the pipe to secure the cooling time of the blast furnace slag. More precisely, it is possible to increase the cooling efficiency by securing the residence time in the inclined pipes 43 and 45 of the blast furnace slag through the reverse cooling air injection injected obliquely from the bottom to the top.

Cooling air is normal air. The cooling air injection lowers the temperature of the blast furnace slag to a certain portion and then supplies it into the cooling tower 20. A plurality of injection holes 43b and 45b are formed in the cooling air injection parts 43a and 45a to allow the cooling air to be injected at a high pressure.

The inclined pipes 43 and 45 have a two-stage structure of the first inclined pipe 43 and the second inclined pipe 45. The two-stage structure of the inclined pipes 43 and 45 is for cooling the blast furnace slag over two stages.

Some of the blast furnace slag separated from the molten iron in the blast furnace by the above structure passes through the second pipe 40 consisting of the vertical pipe 41, the first inclined pipe 43, the second inclined pipe 45 to the cooling tower ( 20) supplied into. In this process, the blast furnace slag is primarily cooled by the cooling air injected from the cooling air inlets 43a and 45a formed at the lower portions of the first inclined pipe 43 and the second inclined pipe 45.

 The cooling water spray nozzle 50 is installed through the installation hole 25 formed between the first and second supply ports 21 and 23 of the cooling tower to which the first pipe 30 and the second pipe 40 are respectively connected. do. The cooling water injection nozzle 50 injects high pressure water into the cooling tower 20 to cool the blast furnace slag supplied into the cooling tower 20.

The cooling tower 20 is provided with a water spray member 60 to which water is sprayed to remove dust generated during cooling of the blast furnace slag. The water spray member 60 is disposed on the upper side of the cooling tower 20 to spray the spray-type water into the cooling tower.

The upper part of the cooling tower 20 is provided with a discharge pipe 29 for discharging hot steam and hot air generated during cooling of the blast furnace slag. The discharge pipe 29 is disposed with a heat exchanger 70 for recovering the heat of the hot steam and hot air to produce hot water.

Hot water production by the heat exchanger 70, by inputting the hot steam and hot air into the heat exchanger 70, and circulating the water stored in the water tank (not shown) to enter the heat exchanger 70 to produce hot water It may be the way.

The operation of the present invention will be described below.

The molten state separated from the molten iron in the blast furnace is injected into the blast furnace slag divided into the first pipe 30 and the second pipe (40).

The blast furnace slag injected into the first pipe 30 is directly supplied into the cooling tower 20 and cooled by the high pressure water injected into the cooling tower 20. Then, the water is suspended in the solid state (W) in the cooling tower (20) lower.

On the other hand, the blast furnace slag (S) injected into the second pipe 40 passes through the vertical pipe 41, falls to the lower portion of the first inclined pipe 43, the first inclined pipe 43, the inclined upward While passing through the second inclined pipe 45, the cooling air is injected into the cooling tower 20 after being cooled by the primary and secondary cooling air injected from the cooling air inlets 43a and 45a. At this time, since the cooling air is injected in the reverse direction (lower to upper) into the first inclined pipe 43 and the second inclined pipe 45, the residence time of the blast furnace slag S in the pipe is increased and the cooling efficiency is increased.

The blast furnace slag supplied into the cooling tower 20 is finally cooled by the high pressure water injected into the cooling tower 20 and floated in the solid state in the water W accumulated under the cooling tower 20.

The dust generated in the cooling process of the blast furnace slag is removed by the water injected from the upper water spray member 60 in the cooling tower 20, and the hot steam and the hot air generated during the cooling of the blast furnace slag are discharge pipes ( Recovered from the heat exchanger 70 installed in 29) is used for hot water production.

On the other hand, the water (W) and blast furnace slag (S) accumulated in the lower portion of the cooling tower 20 is transferred to the storage hopper 80 through the transfer pipe 27 when a predetermined amount or more. The water transferred to the storage hopper 80 is discharged to the lower portion of the storage hopper 80 and sent to the cooling banks 81 and 83 and then supplied to the cooling tower 20 as water or high pressure water for dust removal.

Then, the blast furnace slag remaining in the storage hopper 80 is collected and supplied to the cement factory 90 as a cement raw material.

Table 1 below shows the high-pressure water injection amount required for cooling the blast furnace slag.

division Usage of high pressure water in cooling tower
(High pressure ton / slag 1ton) Water (Spray) Usage in Cooling Tower
(Water ton / slag 1ton) Remarks Inventive Example 0.07ton 0.07ton High Pressure Water Usage
About 20% reduction Comparative example 0.09ton 0.08ton

The present invention is a case in which the blast furnace slag is supplied to the cooling tower through two pipes, and at least one of the two pipes is injected with cooling air for two times to cool the blast furnace slag firstly before being supplied to the cooling tower.

The comparative example is a case in which the blast furnace slag is supplied to the cooling tower through one pipe and the blast furnace slag is cooled through the injection of high pressure water in the cooling tower.

According to Table 1, in the case of the invention example, the amount of high pressure water used was reduced by about 20% compared with the comparative example, and the amount of water injected for dust removal in the cooling tower was also reduced by about 10%.

The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the gist of the present invention, which is understood to be included in the configuration of the present invention.

10: blast furnace 20: cooling tower
21,23: 1st, 2nd supply port 25: Installation worker
27: transfer pipe 29: discharge pipe
30: first pipe 40: second pipe
41: vertical piping 43, 45: first and second inclined piping
43a, 45a: cooling air inlet 43b, 45b: injection hole
50: cooling water spray nozzle 60: water spray member
70: heat exchanger 80: storage hopper
81,83: cooling bank 90: cement factory
W: deceased water S: blast furnace slag (solid)

Claims (8)

The blast furnace slag cooling method characterized in that to supply the blast furnace slag in the molten state to the cooling tower through two pipes and to spray the high pressure water into the cooling tower to cool the blast furnace slag. The method according to claim 1,
Cooling air in the blast furnace slag, characterized in that the cooling air is injected into at least one of the two pipes to be primarily cooled before the blast furnace slag is supplied to the cooling tower. The method according to claim 1,
Cooling method of the blast furnace slag, characterized in that the spraying water for spraying the dust generated during the cooling of the blast furnace slag to the cooling tower. The method according to claim 1,
Cooling method of the blast furnace slag, characterized in that the hot steam generated during the cooling of the blast furnace slag and hot air is recovered and used for producing hot water. Cooling tower;
First and second pipes connected to one side of the cooling tower and supplying blast furnace slag into the cooling tower;
And a coolant spray nozzle installed at adjacent portions of the first pipe and the second pipe to spray high pressure water into the cooling tower to cool the blast furnace slag. The method according to claim 5,
The first pipe or the second pipe
It consists of the structure of vertical piping and inclined piping,
The inclined pipe is formed in a shape inclined from the bottom to the top, the slag cooling apparatus, characterized in that the cooling air injecting portion for injecting the cooling air into the inclined pipe in the inclined lower portion. The method according to claim 5,
Slag cooling apparatus characterized in that the cooling tower is provided with a water spray member is sprayed with water for the removal of dust generated during the cooling of the blast furnace slag. The method according to claim 5,
The upper part of the cooling tower is provided with a discharge pipe for discharging the hot steam and the hot air generated during the cooling of the blast furnace slag,
And a heat exchanger for recovering heat of the hot steam and the hot air to produce hot water in the discharge pipe.
KR1020100094685A 2010-09-29 2010-09-29 Method and apparatus for cooling of slag KR101193693B1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102876821A (en) * 2012-09-03 2013-01-16 中冶南方工程技术有限公司 Water supply method for blast-furnace slag water treatment and water supply systems
CN109439817A (en) * 2018-12-27 2019-03-08 中冶京诚工程技术有限公司 A kind of granulated energy conservation of blast furnace cinder disappears white equipment
CN109457070A (en) * 2018-12-27 2019-03-12 中冶京诚工程技术有限公司 A kind of blast furnace granulated slag process steam disappears bletilla heat reclaiming system
CN110093465A (en) * 2019-04-16 2019-08-06 浙江菲达环保科技股份有限公司 A kind of blast furnace slag flushing vapor disappears white system and method
WO2020032470A1 (en) * 2018-08-07 2020-02-13 주식회사 포스코 Slag treatment facility and slag treatment method
KR20200056102A (en) * 2018-11-14 2020-05-22 주식회사 포스코 Slag processing apparatus and method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5713307Y2 (en) * 1976-05-19 1982-03-17
JPS577848A (en) 1980-06-13 1982-01-16 Nippon Steel Corp Blast furnace slag heat recovery device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102876821A (en) * 2012-09-03 2013-01-16 中冶南方工程技术有限公司 Water supply method for blast-furnace slag water treatment and water supply systems
WO2020032470A1 (en) * 2018-08-07 2020-02-13 주식회사 포스코 Slag treatment facility and slag treatment method
KR20200016630A (en) * 2018-08-07 2020-02-17 주식회사 포스코 Equipment for treating slag and Method for treating slag
KR20200056102A (en) * 2018-11-14 2020-05-22 주식회사 포스코 Slag processing apparatus and method
CN109439817A (en) * 2018-12-27 2019-03-08 中冶京诚工程技术有限公司 A kind of granulated energy conservation of blast furnace cinder disappears white equipment
CN109457070A (en) * 2018-12-27 2019-03-12 中冶京诚工程技术有限公司 A kind of blast furnace granulated slag process steam disappears bletilla heat reclaiming system
CN109457070B (en) * 2018-12-27 2023-12-05 中冶京诚工程技术有限公司 Steam whitening and heat energy recovery system for blast furnace water slag process
CN109439817B (en) * 2018-12-27 2023-12-08 中冶京诚工程技术有限公司 Energy-saving and white-eliminating equipment for granulating blast furnace slag
CN110093465A (en) * 2019-04-16 2019-08-06 浙江菲达环保科技股份有限公司 A kind of blast furnace slag flushing vapor disappears white system and method
CN110093465B (en) * 2019-04-16 2021-06-08 浙江菲达环保科技股份有限公司 Blast furnace slag flushing steam whitening system and method

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