KR20150014698A - Diagnostic apparatus and diagnostic method for refractories of coke oven - Google Patents

Diagnostic apparatus and diagnostic method for refractories of coke oven Download PDF

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Publication number
KR20150014698A
KR20150014698A KR1020130090263A KR20130090263A KR20150014698A KR 20150014698 A KR20150014698 A KR 20150014698A KR 1020130090263 A KR1020130090263 A KR 1020130090263A KR 20130090263 A KR20130090263 A KR 20130090263A KR 20150014698 A KR20150014698 A KR 20150014698A
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refractory
electromagnetic wave
unit
defect
housing
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KR1020130090263A
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Korean (ko)
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박종력
양영철
김정아
장동석
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주식회사 포스코
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Priority to KR1020130090263A priority Critical patent/KR20150014698A/en
Publication of KR20150014698A publication Critical patent/KR20150014698A/en

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B29/00—Other details of coke ovens
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B41/00—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/08—Detecting presence of flaws or irregularities
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Engineering & Computer Science (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Materials Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Molecular Biology (AREA)
  • Coke Industry (AREA)

Abstract

The present invention relates to an apparatus for diagnosing refractories in a carbonizing chamber of a coke oven, which can precisely diagnose not only surface defect of the refractories in the carbonizing chamber, but also internal defect and the condition of the refractories even if foreign substances are attached. According to an embodiment of the present invention, the apparatus for diagnosing the refractories in the carbonizing chamber of the coke oven comprises a housing installed in RAM equipped in a pusher car; an electromagnetic wave transceiving unit making electromagnetic wave incident on the refractories in the carbonizing chamber, and receiving the reflected electromagnetic wave; and a diagnosis unit receiving the electromagnetic wave received from the electromagnetic wave transceiving unit, and diagnosing the condition of the refractories based on wavelength and reflex time of the electromagnetic wave.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a carbonization chamber refractory diagnosis apparatus and a diagnosis method for a carbonization chamber of a coke oven,

The present invention relates to an apparatus for diagnosing a refractory of a carbonized chamber, and more particularly, to an apparatus for diagnosing a refractory of a carbonized chamber, And a refractory diagnosis apparatus.

Generally, COKES is a kind of coal charcoal that is used as a heat source and a reducing agent in a blast furnace, and is used as a means to secure ventilation, and is produced in a coke oven.

During the drying process of the bituminous coal during the manufacturing process of the coke, the hydrocarbons of the bituminous coal are pyrolyzed to form a deposit of CARBON, which reduces the internal volume of the carbonaceous chamber, makes it difficult to charge the coking oven, The function of the coke oven facility is degraded.

FIG. 1 is a schematic view showing a general coke oven operation process. As shown in FIG. 1, in a coke producing process, coal having cohesive nature is introduced into a coke oven 1 through a charging car 40 And charged into the carbonization chamber 30 of the coke oven 1 via four inlet ports. The coke oven 1 is indirectly heated at a temperature of 1,300 degrees Celsius with the coke oven 1 being closed, and is then carbonized for about 18 hours. The finished glow coke is pushed out of the coke oven by the pusher car 10.

A large amount of coke oven gas (COG) is generated due to the action of the coal charged in the carbonization chamber 30 of the coke oven 1 and the combustion gas supplied from the outside during the process of generating the coke oven gas , The generated coke oven gas (COG) flows through the upper space in which coal is deposited in the inner space of the carbonization chamber 30 formed in the coke oven 1, passes through the riser pipe, is collected in the gas main pipe, It is sent through the main building to other facilities, eg Mars facilities. The flow of the coke oven gas is continuous for 24 hours, and the gas sent to the chemical plant is used as fuel for the steelworks through the refineries.

At this time, the inside of the carbonization chamber 30 of the coke oven 1 is provided with a refractory capable of withstanding high temperatures. However, the refractories are cracked or melted due to various factors such as a sudden temperature change in the coke production process, and carbon deposits generated during the coke production process.

In addition, when coal is charged into the carbonization chamber 30 or when the produced coke is extruded, a large pressure is applied to the refractory, thereby causing damage to the refractory, such as abrasion, defects and deformation.

If the refractory is damaged, the COG is leaked through cracks such as cracks or the like and released to the atmosphere to cause air pollution, deteriorate the productivity and decrease the life of the coke oven (1) .

In addition, if breakage, deformation, or the like breakage occurs in the refractory, carbon is adhered to the breakage site, and the inside width of the carbonization chamber is narrowed.

Therefore, it is necessary to periodically diagnose the degree of damage and aging of the refractory provided in the carbonization chamber, and to maintain and repair it.

Conventionally, an apparatus and a method for diagnosing the state of a refractory by photographing the inner wall of a carbonization chamber or measuring the inner width of the carbonization chamber are described in detail in "Apparatus for diagnosing the inner wall of a heating furnace (Patent No. 10-2012-0113870) " and" Diagnostic Apparatus and Diagnostic Method (Patent Document 10-2005-00117474) ".

However, this diagnostic apparatus and method have a problem in that it is impossible to diagnose internal defects because only the surface of the refractory is observed by measuring the change in the nap width by measuring the distance between refractories installed on both sides of the refractory.

Further, when foreign substances such as carbon are adhered to the surface of the refractory, diagnosis is impossible and reliability of the refractory diagnosis result is low.

Patent No. 10-2012-0113870 (Oct. 16, 2012) Patent Document 10-2005-0117475 (December 14, 2005)

The present invention provides an apparatus and method for diagnosing a refractory of a carbonized-chamber refractory of a coke oven which can improve the reliability of diagnosis results of a refractory provided in a carbonized chamber.

The present invention also provides an apparatus and method for diagnosing carbonaceous refractory of a coke oven which is easy to maintain and repair by diagnosing the degree and position of internal defects as well as surface defects of the refractory.

The apparatus for diagnosing the refractory of a carbonized chamber of a coke oven according to an embodiment of the present invention is capable of accurately diagnosing not only surface defects of a refractory of a carbonized chamber but also states of internal defects and refractories, The present invention relates to a diagnosing apparatus, comprising: a housing provided in a RAM provided in an extruded car; An electromagnetic wave transmitting / receiving unit which receives an electromagnetic wave reflected from the refractory of the carbonization chamber and receives the reflected electromagnetic wave; And a diagnostic unit that receives the electromagnetic wave received by the electromagnetic wave transmitting and receiving unit and diagnoses the state of the refractory based on the wavelength and the reflection time of the electromagnetic wave.

The electromagnetic wave transmitting and receiving unit includes an oscillating unit installed in the housing and generating an electromagnetic wave capable of penetrating into the refractory to simultaneously detect surface defects and internal defects of the refractory; A radiator for radiating electromagnetic waves generated from the oscillation unit to refractories provided on both side walls of the carbonization chamber; And a receiver for receiving the electromagnetic waves reflected from the boundary surface of the refractory.

According to an embodiment of the present invention, the outer surface of the electromagnetic wave transmitting and receiving unit is received in the casing so as to be spaced apart from the inner wall of the housing to form a gas flow path, and nitrogen A gas inlet hole is formed to penetrate the gas inlet hole so that gas can be supplied, a gas outlet hole is formed so that the gas supplied to the gas inlet hole can be discharged along the gas outlet, and the nitrogen gas discharged to the gas outlet hole is circulated And a cooling unit for supplying nitrogen gas to the gas inflow hole.

Wherein the electromagnetic wave has a frequency in a range of 250 to 2,400 MHz. The apparatus for diagnosing carbonization chamber refractory of a coke oven.

The housing is formed of a ceramic material, and a heat insulating material is attached to an inner wall of the housing.

The diagnostic unit compares the wavelength and the reflection time of the electromagnetic wave transmitted from the electromagnetic wave transmitting and receiving unit with the wavelength and the reflection time of the reference electromagnetic wave inputted in advance and classifies the defect into the internal defect and the surface defect, .

The diagnostic unit may include: a signal amplifying unit amplifying a signal of an electromagnetic wave transmitted from the electromagnetic wave transmitting / receiving unit; A signal processing unit for removing noise in the electromagnetic wave amplified by the signal amplifying unit; And a data processor for receiving electromagnetic waves from which noises are removed from the signal processing unit and determining a defect of the refractory.

According to an embodiment of the present invention, the apparatus for diagnosing a refractory of a carbonized-chamber refractory of a coke oven receives defect information of the refractory from the diagnosis unit and outputs internal defects and surface defects differently according to the degree of defects. And outputs the output signal.

According to an embodiment of the present invention, there is provided a method of diagnosing a refractory of a carbonized chamber of a coke oven, comprising: injecting an electromagnetic wave having an impulse waveform into a refractory disposed on both sides of the refractory by being inserted into a carbonization chamber of a coke oven; And simultaneously diagnoses the surface defects and the internal defects of the refractory.

A method of diagnosing a refractory of a carbonized chamber of a coke oven according to an embodiment of the present invention includes the steps of generating electromagnetic waves having a frequency in a range of 250 to 2,400 MHz so as to permeate into the refractory; Transmitting the electromagnetic wave generated in the process of generating the electromagnetic wave in the direction of the refractory; Receiving electromagnetic waves reflected from a boundary surface of the refractory; And comparing the reflection time and the wavelength of the received electromagnetic wave with a reference value to determine a defect of the refractory.

The step of determining the defect of the refractory includes: a signal processing step of amplifying the received electromagnetic wave and removing noise; And a refractory diagnosis step of comparing the reflection time and wavelength of the electromagnetic wave processed in the signal processing step with the reference value to determine the degree of defect and the defect occurrence position of the refractory.

A method of diagnosing a refractory of a carbonized chamber of a coke oven according to an embodiment of the present invention includes dividing the refractory into a color difference according to a defect occurrence position of the refractory diagnosed in the refractory diagnosis step, And outputting the output signal.

According to the embodiment of the present invention, it is possible to accurately grasp not only the surface defects of refractories but also the position and degree of occurrence of internal defects by using electromagnetic waves that can permeate into the inside of the refractory.

Further, there is an effect of facilitating defect judgment by outputting color difference depending on the kind, position and degree of defect.

Further, it is possible to determine the position of the defect and to facilitate the maintenance and repair, and to easily determine the maintenance period and the repair method, thereby reducing the maintenance and repair cost and extending the life of the refractory.

1 is a schematic view showing a general coke oven operation process,
FIG. 2 is a view showing the installation of the apparatus for diagnosing carbonaceous refractory of a coke oven according to an embodiment of the present invention,
3 is a view for explaining an apparatus for diagnosing a refractory of a carbonized chamber of a coke oven according to an embodiment of the present invention,
4 is a view showing refractories with internal defects and surface defects,
5 is a view showing a result of diagnosis of the refractory of FIG. 4 using the apparatus for diagnosing carbonaceous refractory of a coke oven, and FIG.
6 is a flowchart illustrating a method for diagnosing a refractory of a carbonized chamber of a coke oven according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments. For reference, the same numbers in this description refer to substantially the same elements and can be described with reference to the contents described in the other drawings under these rules, and the contents which are judged to be obvious to the person skilled in the art or repeated can be omitted.

FIG. 2 is a view showing the installation of the apparatus for diagnosing a refractory of a carbonized chamber of a coke oven according to an embodiment of the present invention. FIG. 3 is a view for explaining an apparatus for diagnosing a refractory of a carbonized chamber of a coke oven according to an embodiment of the present invention. to be.

2 to 3, the apparatus for diagnosing carbonaceous refractory of a coke oven according to an embodiment of the present invention includes a RAM (RAM) 11 which is drawn out from an extruded car 10 and enters a carbonization chamber 30 The electromagnetic wave received by the electromagnetic wave transmitting and receiving unit 200 and the electromagnetic wave receiving and receiving unit 200 accommodated in the housing 100 to transmit and receive electromagnetic waves is received to diagnose the state of the refractory 20 And a diagnosis unit 300 for performing diagnosis.

2, the ram 11 includes a ram head 11a and a ram beam 11b. The housing 100 includes the ram head 11a in the traveling direction of the ram 11, And it is preferable that the guide ribs are disposed on the ram beam 11b so as to be positioned at the rear end. This is because it is possible to prevent the housing 100 from being exposed to a high temperature immediately upon entry into the high temperature carbonization chamber 30 and to prevent the housing 100 from being damaged by foreign substances such as carbon adhered to the inside of the carbonization chamber 30. [

Preferably, the housing 100 is formed of a ceramic material having excellent heat-shielding performance, and further includes a heat-insulating material inside the housing 100 to improve the heat-shielding performance. Thus, the electromagnetic wave transmitting / receiving unit 200 housed in the housing 100 is prevented from being exposed to high temperatures and being damaged.

The electromagnetic wave transmission and reception unit 200 includes an oscillation unit 210 for generating electromagnetic waves, a transmission unit 220 for transmitting the electromagnetic waves generated from the oscillation unit 210 to the refractory 20 installed on both side walls of the carbonization chamber 30, And a receiver 230 for receiving the electromagnetic waves reflected from the interface of the medium of the refractory 20.

The frequency of the electromagnetic wave generated in the oscillation unit 210 and sent to the refractory 20 preferably ranges from 250 to 2,400 MHz. If the frequency of the electromagnetic wave is less than 250 MHz, the reliability of the diagnosis result of the refractory 20 deteriorates. If the frequency of the electromagnetic wave exceeds 2,400 MHz, the electromagnetic wave can not sufficiently permeate into the refractory 20, It is impossible to detect the internal defects 22 generated in the inside of the semiconductor device.

The delivery unit 220 and the reception unit 230 may include a pair of delivery holes 110 formed on both sides of the housing 100 to partially expose the housing 100, The transmitting unit 220 and the receiving unit 230 are disposed adjacent to each other.

The apparatus for diagnosing the refractory of a carbonized chamber of a coke oven according to the present invention includes a cooling unit for circulating a nitrogen gas in the housing 100 so that the electromagnetic wave transmission and reception unit 200 is not damaged by the high temperature of the carbonization chamber 30, (500).

The cooling unit 500 is provided between the electromagnetic wave transmitting and receiving unit 200 that supplies nitrogen gas to the gas inflow hole 130 formed in the housing 100 and is spaced apart from the inner wall of the housing 100 Exchanges the nitrogen gas that has been heat-exchanged through the gas exhaust hole 140 formed in the housing 100 by cooling the electromagnetic wave transmitting / receiving unit 200 while moving along the gas flow path.

At this time, the nitrogen gas may be replaced by an inert gas which is not reacted by the high temperature inside the carbonization chamber 30.

The diagnosis unit 300 sets the reflection time and the wavelength information of the electromagnetic wave reflected from the refractory 20 in the steady state as a reference value and the refractory 20 formed inside the carbonization chamber 30 from the reception unit 230 And then compares the reflection time and the wavelength information with the reference value to diagnose the type and degree of the defect.

The diagnostic unit 300 includes a signal amplification unit that receives electromagnetic waves reflected from the electromagnetic wave transmission and reception unit 200 and amplifies the signal, a signal processing unit that removes noise from the electromagnetic waves amplified by the signal amplification unit, And the reflection time and the wavelength information are compared with the reference value to diagnose the type of defect and the degree of defect. At this time, it is possible to diagnose to the defect position.

The apparatus for diagnosing carbonaceous refractory of a coke oven according to an embodiment of the present invention may further include a monitoring unit 400 for outputting an image for monitoring the state of the refractory 20 diagnosed by the diagnosis unit 300 . Accordingly, the operator can easily determine the defect position and the degree of the refractory 20 through the image output from the monitoring unit 400.

FIG. 4 is a view showing refractories having internal defects and surface defects, and FIG. 5 is a view showing the results of diagnosis of the refractories shown in FIG. 4 using a carbonization chamber refractory diagnosis apparatus of a coke oven.

4 to 5, the diagnosis unit 300 according to an exemplary embodiment of the present invention converts the diagnosis result of the refractory 20 into a 3D image and transmits the 3D image to the monitoring unit 400. FIG. At this time, the internal defects 22 and the surface defects 21 of the refractory 20 are divided into hues, and the shade is varied according to the degree, so that the operator can easily identify the type and degree of defects with the naked eye.

At this time, the diagnosis unit 300 divides the surface defect 21 of the refractory 20 into a negative value and the internal defect 22 with a positive value based on a steady state 0, And transmits the image to the monitoring unit.

A method for diagnosing a refractory of a carbonized chamber of a coke oven using the coke guide according to an embodiment of the present invention will now be described with reference to the drawings.

6 is a flowchart illustrating a method for diagnosing a refractory of a carbonized chamber of a coke oven according to an embodiment of the present invention.

6, nitrogen gas is circulated in the housing 100 by operating the cooling unit 500. When the ram 11 enters the carbonization chamber 30, The oscillator 210 provided in the oscillator 11b generates an electromagnetic wave having a frequency in the range of 250 to 2,400 MHz.

The microwave generated in the oscillation unit 210 is transmitted to the transmission unit 220 and the transmission unit 220 receives electromagnetic waves into the refractory 20 installed in the carbonization chamber 30, .

At this time, the receiving unit 230 receives electromagnetic waves reflected from the medium interface such as surface defects 21 or internal defects 22 of the refractory 20, and transmits the reflected electromagnetic waves to the diagnosis unit 300.

The diagnosis unit 300 amplifies the reflection time and wavelength information signals of the electromagnetic wave reflected from the refractory 20 received from the receiving unit 230 and performs a signal processing step of removing the noise, And a refractory diagnosis step of comparing the time and the wavelength with the reference value to determine a degree of defect and a defect occurrence position of the refractory.

When the diagnosis of the refractory 20 is completed, the diagnosis unit 300 converts the result into a 3D image having a difference in lightness according to the degree of defect, according to the type of defect in the refractory 20, And transmits it to the monitoring unit 400 and outputs the same.

Although the present invention has been described with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the following claims. It can be understood that

1: Coke oven 10: Extruded tea
11: RAM 20: Refractory
21: surface defect 22: internal defect
30: Carbonization chamber 40: Charging car
100: housing 200: electromagnetic wave transmitting / receiving unit
210: oscillation unit 220:
230: Receiving unit 300: Diagnostic unit
400: monitoring unit 500: cooling unit

Claims (12)

A housing provided in a RAM provided in the extruded car;
An electromagnetic wave transmitting / receiving unit which receives an electromagnetic wave reflected from the refractory of the carbonization chamber and receives the reflected electromagnetic wave; And
And a diagnostic unit that receives the electromagnetic wave received by the electromagnetic wave transmitting and receiving unit and diagnoses the state of the refractory based on the wavelength and the reflection time of the electromagnetic wave.
The method according to claim 1,
The electromagnetic wave transmitting /
An oscillating unit installed in the housing and generating an electromagnetic wave capable of penetrating into the refractory to simultaneously detect surface defects and internal defects of the refractory;
A radiator for radiating electromagnetic waves generated from the oscillation unit to refractories provided on both side walls of the carbonization chamber; And
And a receiver for receiving the electromagnetic waves reflected at the interface between the refractory and the refractory.
The method according to claim 1,
Wherein the housing has a gas inlet hole formed therein for receiving nitrogen gas therein, the gas inlet hole being formed in the housing, the gas inlet hole being formed in the housing, A gas discharge hole is formed so that the gas supplied to the inlet hole can be discharged along the gas flow passage,
And a cooling unit circulating the nitrogen gas discharged to the gas discharging hole to supply the nitrogen gas to the gas inflow hole.
The method according to claim 1,
Wherein the electromagnetic wave has a frequency in the range of 250 to 2,400 MHz.
The method according to claim 1,
Wherein the housing is formed of a ceramic material, and a heat insulating material is attached to the inner wall of the housing.
The method according to claim 1,
The diagnostic unit may include:
Wherein the degree of the defect is determined by dividing the wavelength and the reflection time of the electromagnetic wave transmitted from the electromagnetic wave transmitting and receiving unit into the internal defect and the surface defect by comparing the wavelength and the reflection time of the electromagnetic wave received from the electromagnetic wave transmitting and receiving unit, Of the refractory.
The method of claim 6,
The diagnostic unit may include:
A signal amplifying unit amplifying a signal of an electromagnetic wave transmitted from the electromagnetic wave transmitting / receiving unit;
A signal processing unit for removing noise in the electromagnetic wave amplified by the signal amplifying unit; And
And a data processing unit for receiving electromagnetic waves from which noises have been removed from the signal processing unit and determining a defect of the refractory.

The method of claim 6,
And a monitoring unit that receives the defect information of the refractory from the diagnosis unit and outputs internal defects and surface defects differently depending on the degree of defects, Refractory diagnosis system.
A coke oven which is capable of simultaneously diagnosing surface defects and internal defects of the refractory by receiving electromagnetic waves reflected from a boundary surface of the refractory at an interface between the refractory and the coke oven, A method of diagnosing a refractory of a carbonized chamber.
The method of claim 9,
Generating an electromagnetic wave having a frequency in a range of 250 to 2,400 MHz so as to permeate the refractory;
Transmitting the electromagnetic wave generated in the process of generating the electromagnetic wave in the direction of the refractory;
Receiving electromagnetic waves reflected from a boundary surface of the refractory; And
And comparing the reflection time and the wavelength of the received electromagnetic wave with a reference value to determine a defect of the refractory.
The method of claim 10,
The process of determining the defect of the refractory may include:
A signal processing step of amplifying the received electromagnetic wave and removing noise; And
And a refractory diagnosis step of comparing the reflection time and the wavelength of the electromagnetic wave processed in the signal processing step with the reference value to determine the degree of defect and the defect occurrence position of the refractory.
The method of claim 11,
And a monitoring step of sorting the refractory by a color difference according to a defect occurrence position of the refractory diagnosed in the refractory diagnosis step and outputting the classified color difference to a monitor according to the degree of defect of the refractory, .
KR1020130090263A 2013-07-30 2013-07-30 Diagnostic apparatus and diagnostic method for refractories of coke oven KR20150014698A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170019176A (en) * 2015-08-11 2017-02-21 주식회사 포스코 Object Processing Facilites and Recovery Method for Refractories of the same
KR101875151B1 (en) * 2016-12-23 2018-07-06 주식회사 포스코 Diagnostic apparatus and method for brick of chamber

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170019176A (en) * 2015-08-11 2017-02-21 주식회사 포스코 Object Processing Facilites and Recovery Method for Refractories of the same
KR101875151B1 (en) * 2016-12-23 2018-07-06 주식회사 포스코 Diagnostic apparatus and method for brick of chamber

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