KR20010065422A - Device for removing slag attached in gas pot ring and elbow of electric furnace - Google Patents

Device for removing slag attached in gas pot ring and elbow of electric furnace Download PDF

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Publication number
KR20010065422A
KR20010065422A KR1019990065308A KR19990065308A KR20010065422A KR 20010065422 A KR20010065422 A KR 20010065422A KR 1019990065308 A KR1019990065308 A KR 1019990065308A KR 19990065308 A KR19990065308 A KR 19990065308A KR 20010065422 A KR20010065422 A KR 20010065422A
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KR
South Korea
Prior art keywords
cut
guide ring
ring
incision
attached
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Application number
KR1019990065308A
Other languages
Korean (ko)
Inventor
엄정수
우경회
김길범
Original Assignee
이구택
포항종합제철 주식회사
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Application filed by 이구택, 포항종합제철 주식회사 filed Critical 이구택
Priority to KR1019990065308A priority Critical patent/KR20010065422A/en
Publication of KR20010065422A publication Critical patent/KR20010065422A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
    • 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
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

PURPOSE: A skull removing apparatus attached to a gas port ring and a bent pipe part of an electric furnace roof is provided to prevent environmental pollution by improving dust-collecting efficiency and prevent a rotary equipment for opening and shutting the electric furnace roof from being damaged due to the attachment of excessive skull. CONSTITUTION: A skull removing apparatus attached to a gas port ring(3) and a bent pipe part(4) of an electric furnace roof(2) includes a cut and opened part(10) having a lower part hinge-coupled with the cut and opened position of the part where skull of the bent pipe part fused, a cut and opened part supporting element(11) connected with the bent pipe part for supporting the cut and opened part to prevent the cut and opened part from being separated, a cut and opened part weight(12) attached to the outer surface of the cut and opened part for forwarding and backwarding the cut and opened part into the inside of the bent pipe part, a guide ring(14) connected to an axis with covering the bent pipe part at the lower part of the cut and opened part weight, rotating on the axis, fixing a protruded guide ring stopper (16) on one side, a cylinder(15) attached to the other side of the guide ring for driving the guide ring to be rotated, a front end(18) positioned at the upper part of the gas port ring, and a rear end(19) positioned at the lower part of the guide ring stopper.

Description

전기로 루프의 개스포트링 및 곡관부에 부착된 지금 제거장치{Device for removing slag attached in gas pot ring and elbow of electric furnace}Device for removing slag attached in gas pot ring and elbow of electric furnace}

본 발명은 전기로 루프의 개스포트링 및 곡관부에 부착된 지금을 제거하는장치에 관한 것으로, 더욱 상세하게는 전기로에서의 용강 제조공정 중 로 내에서 발생되는 고온의 폐가스 및 분진류를 포집하는 덕트의 입구에 설치되어 있는 개스포트링의 내벽과 곡관부 하부에 부착된 지금 및 분진류를 제거하기 위한 장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for removing the dust attached to the gas gasket and bent portion of an electric furnace loop. The present invention relates to a device for removing dust and dust adhering to the inner wall of the gasket ring installed at the inlet of the duct and the lower part of the curved pipe part.

일반적으로 전기로 내에서 용강 제조공정 중 발생되는 고온의 폐가스 및 용융 슬래그는 도 4에 도시된 바와 같이, 전기로(1) 루프(2)의 상면에 설치되어 있는 개스포트링(3)과, 개스포트링(3) 상부에서 소정거리 이격되어 설치된 곡관부(4)를 통과하면서 고착되고 나머지는 개스덕트(5)를 지나 집진장치로 보내진다.In general, the hot waste gas and the molten slag generated during the molten steel manufacturing process in the electric furnace are, as shown in FIG. 4, the gasket ring 3 installed on the upper surface of the electric furnace loop 2. It is fixed while passing through the curved pipe portion 4 installed at a predetermined distance from the upper portion of the gas port ring 3, and the rest is passed through the gas duct 5 to the dust collector.

이 과정에서 개스포트링(3) 및 곡관부(4) 내벽에는 스플래쉬 슬래그가 잔존하게 되며 작업시간이 경과하면 도 5에 도시된 바와 같이 지금(6)이 형성되는데, 이러한 지금은 개스포트링(3)과 곡관부(4)의 내경을 축소시켜 집진효율을 떨어뜨리므로 제거해야할 필요가 있다.In this process, the splash slag remains on the inner wall of the gasket ring 3 and the bent portion 4, and now, as shown in FIG. 5, when the working time elapses, the gasket ring 3 is formed. 3) and the inner diameter of the curved pipe 4 to reduce the dust collection efficiency, it is necessary to remove.

종래에는 도 6에 도시된 바와 같은 지금 제거장치(7)를 이용하여 곡관부(4)의 일부를 절개하고 절개부(8)에 지금 제거장치(7)를 설치하여 지금(6)을 제거하였다.In the related art, a part of the curved pipe portion 4 is cut using the now removing device 7 as shown in FIG. 6, and the removing device 7 is installed in the cutout 8 to remove the now present 6. .

그러나, 종래의 지금 제거장치(7)로는 곡관부(4) 상부의 지금 제거는 가능하였지만 곡관부(4) 하부, 즉 개스포트링(3)과의 연결부에 융착된 지금 제거는 불가능하였다. 이로 인해 집진이 불량하여 환경오염이 발생되며, 개스포트링(3)의 내벽에는 지금 부착이 더욱 심해지는 문제점이 있었다.However, although the removal of the upper part of the curved part 4 was possible with the conventional removal apparatus 7 now, it is impossible to remove it now fused to the lower part of the curved part 4, ie, the connection part with the gasket | ring 3. Due to this, dust collection is poor and environmental pollution occurs, and the inner wall of the gasket ring 3 has a problem in that attachment is more severe.

이러한 상태로 조업이 진행되면 개스포트링과 곡관부에는 지금 슬래그가 두껍게 융착되어 전기로 루프의 개, 폐 작동을 위한 회전이 불가능해지는 문제점이 있었다.When the operation proceeds in this state, the slag is now thickly fused to the gasket ring and the bent portion, and there is a problem in that rotation for opening and closing of the electric loop is impossible.

본 발명은 상기한 바와 같은 문제점을 해결하기 위한 것으로, 그 목적은 전기로에서의 용융작업 중 개스포트링 및 곡관부에 부착되는 지금을 동시에 제거하는 장치를 제공하는 데 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an apparatus for simultaneously removing the current attached to the gasket and the bent portion during the melting operation in the electric furnace.

도 1은 본 발명에 따른 전기로 루프의 개스포트링 및 곡관부에 부착된 지금 제거장치의 사시도이다.1 is a perspective view of a now removing device attached to the gasket ring and bend of the furnace loop according to the invention.

도 2는 도 1에서 개스포트링 지금 제거장치를 확대도시한 사시도이다.FIG. 2 is an enlarged perspective view of the gasket ring removing device of FIG. 1.

도 3은 본 발명에 따른 지금 제거장치에 의해 개스포트링의 지금을 제거하는 작업이 도시된 사시도이다.Figure 3 is a perspective view showing the operation of removing the gasket ring now by the now removing device according to the present invention.

도 4는 일반적인 전기로 루프의 상부에 설치된 개스포트링과, 곡관부(4) 및 개스덕트가 도시된 사시도이다.4 is a perspective view showing a gasket ring, a bend portion 4 and a gas duct installed on an upper portion of a general furnace roof.

도 5는 개스포트링 및 곡관부에 지금이 형성된 상태가 도시된 절개사시도이다.5 is a cutaway perspective view showing a state in which gaskets are formed in the bent ring and the bent portion.

도 6은 종래의 지금 제거장치를 이용하여 곡관부 내에 부착된 지금을 제거하는 작업이 도시된 사시도이다.Figure 6 is a perspective view showing the operation of removing the now attached in the curved portion using a conventional now removing device.

상기한 바와 같은 목적을 달성하기 위하여, 본 발명에 따른 전기로 루프의 개스포트링 및 곡관부에 부착된 지금 제거장치는, 곡관부의 지금이 융착되는 부위의 절개된 위치에 하측이 힌지결합된 절개부; 곡관부에 연결되어 절개부가 이탈하지 않도록 지지하는 절개부 지지대; 절개부의 외면에 부착되어 절개부를 곡관부의 내부로 전후진시키는 절개부 중량추; 절개부 중량추의 하부에서 곡관부를 감싸면서 축으로 연결되고, 축을 중심으로 회동운동하며, 일측에 돌출된 가이드링 스토퍼가 고정된 가이드링; 가이드링의 타측에 부착되어 가이드링이 회동하도록 구동하는 실린더; 및 전기로 루프의 상면에 설치되고, 개스포트링 상부에 위치하는 선단과 가이드링 스토퍼 하부에 위치하는 후단을 포함하는 다관절 구조로 이루어진 개스포트링 지금 제거장치를 포함하여 이루어지는 것을 특징으로 한다.In order to achieve the object as described above, the now removing device attached to the gasket ring and the bent portion of the electric furnace loop according to the present invention, the lower side hinged incision in the cut position of the now fused portion of the bend portion part; An incision support that is connected to the bend and supports the incision so that it is not separated; An incision weight that is attached to an outer surface of the incision to advance the incision back and forth into the inside of the bend; A guide ring connected to the shaft while surrounding the bent portion at the lower portion of the incision weight, pivoting about the axis, and having a guide ring stopper protruding from one side; A cylinder attached to the other side of the guide ring to drive the guide ring to rotate; And a gasket ring removing device, which is installed on an upper surface of the furnace loop and has a multi-joint structure including a front end positioned above the gasket ring and a rear end positioned below the guide ring stopper.

이하, 본 발명에 따른 전기로 루프의 개스포트링 및 곡관부에 부착된 지금 제거장치의 구성에 대해 첨부된 도면을 참조하여 상세히 설명한다.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a configuration of a gasket ring and a bend removing device attached to a curved portion of an electric furnace loop according to the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 따른 전기로 루프의 개스포트링 및 곡관부에 부착된 지금제거장치의 사시도이고, 도 2는 도 1에서 개스포트링 지금 제거장치를 확대도시한 사시도이며, 도 3은 본 발명에 따른 지금 제거장치에 의해 개스포트링의 지금을 제거하는 작업이 도시된 사시도이다.1 is a perspective view of a gripping ring removing device attached to the gasket ring and the bent portion of the electric furnace loop according to the present invention, Figure 2 is an enlarged perspective view of the gasket ring removing device in Figure 1, Figure 3 It is a perspective view showing the operation of removing the gasket ring now by the now removing device according to the invention.

이들 도면에 도시된 바와 같이, 본 발명에 따른 전기로 루프의 개스포트링 및 곡관부에 부착된 지금 제거장치는 개스포트링(3)과 인접한 전기로 루프(2) 상면과, 개스포트링(3)으로부터 소정거리 이격되어 설치된 곡관부(4)에 설치되어 있다.As shown in these figures, the now removing device attached to the gasket ring and curvature of the furnace loop according to the present invention comprises an upper surface of the furnace loop 2 adjacent to the gasket ring 3, and a gasket ring ( It is provided in the curved pipe part 4 installed so that the predetermined distance may be separated from 3).

곡관부(4)에서 지금이 융착되는 부위는 절개되어 있고, 이 절개부(10)는 곡관부의 하측에 힌지(23)결합되어 있으며, 절개부(10)가 곡관부(4)로부터 이탈되지 않도록 지지하는 절개부 지지대가(11)가 곡관부(4)에 연결되어 있다.In the curved part 4, the part which is fusion | melted now is cut | disconnected, This cut | disconnected part 10 is hinged by the lower side of the curved part part 23, and the cut | disconnected part 10 is not detached from the curved part 4. An incision support stand 11 for supporting is connected to the bent portion 4.

절개부(10)의 외면에는 중량추(12)가 부착되어 절개부(10)를 곡관부(4)의 내부로 전후진시키도록 되어 있으며, 절개부(10)가 곡관부(4)의 내부로 전진될 때 곡관부(4)의 내벽에 부착된 지금이 제거되는 것이다.The weight 12 is attached to the outer surface of the cutout 10 to advance the cutout 10 back and forth into the bend 4, and the cutout 10 is inside the bend 4. As it moves forward, the now attached to the inner wall of the bend 4 is removed.

절개부 중량추(12)의 하부에는 곡관부(4)의 외부를 감싸면서 곡관부(4)와 축(13)으로 연결된 가이드링(14)이 설치되며, 가이드링(14)은 그 축(13)을 중심으로 회동운동한다. 즉, 가이드링(14)이 회동운동할 때 절개부 중량추(12)를 상승시키면 절개부(10)가 곡관부(4)의 내부로 전진되며, 절개부(10)의 전진 후에는 자중에 의해 중량추(12)가 하강하고 이로 인해 절개부(10)는 후진하게 되는 것이다.The lower portion of the incision weight 12 is provided with a guide ring 14 connected to the bend portion 4 and the shaft 13 while surrounding the outside of the bend portion 4, and the guide ring 14 is formed on the shaft ( Rotate around 13). That is, when the guide ring 14 is rotated and the incision weight 12 is raised, the incision 10 is advanced to the inside of the bent portion 4, and after the incision 10 is moved forward to its own weight. The weight 12 is lowered by this and the incision 10 is to be reversed.

가이드링(14)의 일측에는 가이드링(14)의 회동운동을 구동하는 실린더(15)가 설치되며, 가이드링(14)의 타측에는 가이드링 스토퍼(16)가 부착되어 있으며, 가이드링 스토퍼(16)는 실린더(15)에 의해 회동운동하는 가이드링(14)과 함께 승하강된다.One side of the guide ring 14 is provided with a cylinder 15 for driving the rotational movement of the guide ring 14, the other side of the guide ring 14 is a guide ring stopper 16 is attached, the guide ring stopper ( 16 is raised and lowered together with the guide ring 14 which rotates by the cylinder 15.

개스포트링(3)과 인접한 전기로 루프(2)의 상면에는 다관절 구조의 개스포트링 지금 제거장치(17)가 설치되는데, 다관절 구조의 개스포트링 지금 제거장치(17)의 선단(18)은 개스포트링(3) 상부에 위치하고, 후단(19)은 가이드링 스토퍼(16) 하부에 위치한다.On the upper surface of the furnace loop (2) adjacent to the gasket ring (3), a multi-joint gasket ring removing device (17) is installed. 18 is located above the gasket ring 3, and the rear end 19 is located below the guide ring stopper 16.

개스포트링 지금 제거장치(17)는 도 2에 도시된 바와 같이, 하강하는 가이드링 스토퍼(16)에 의해 후단(19)이 하강하면 루프(2)의 상면에 축 연결된 후단(19)의 반대편(20)이 상승하고, 이와 연결부재(21)를 매개로 하여 연결된 선단(18)의 반대편(22)이 함께 상승하며, 결과적으로 선단(18)은 하강하도록 되어 있다.As shown in FIG. 2, the gasket ring removing device 17 is opposite to the rear end 19 axially connected to the upper surface of the loop 2 when the rear end 19 is lowered by the descending guide ring stopper 16. 20 rises, the opposite side 22 of the tip 18 connected via the connecting member 21 rises together, and as a result, the tip 18 is lowered.

이러한 방식으로 개스포트링 지금 제거장치(17)의 선단(18)이 하강하면 개스포트링(3) 내부의 지금을 하부로 밀어뜨려 제거하게 되는 것이다. 이 때 선단(18)의 반대편(22)에는 중량추가 형성되어 있어서, 가이드링 스토퍼(16)가 복귀하면 선단(18)이 상승하도록 되어 있다.In this manner, when the tip 18 of the gasket ring removing device 17 is lowered, the gasket inside the gasket ring 3 is pushed downward to be removed. At this time, a weight is formed on the opposite side 22 of the tip 18 so that the tip 18 is raised when the guide ring stopper 16 returns.

이하, 본 발명에 따른 전기로 루프의 개스포트링 및 곡관부에 부착된 지금 제거장치의 작용에 대해 상세히 설명한다.Hereinafter, the operation of the now removing device attached to the gasket ring and the bent portion of the furnace loop according to the present invention will be described in detail.

전기로 내에서의 용강 제조공정 중 개스포트링(3) 및 곡관부(4)에 지금이 형성되면, 작업자는 지금 제거를 위해 실린더(15)를 작동시킨다.If now is formed in the gasket ring 3 and the bent portion 4 during the molten steel manufacturing process in the electric furnace, the operator now operates the cylinder 15 for removal.

실린더(15)가 압축되면 가이드링(14)이 축(13)을 중심으로 회동하고, 실린더(15)와 반대측에 설치된 가이드링 스토퍼(13)는 하강하여 도 3에 도시된 바와 같이, 개스포트링 지금 제거장치(17)의 후단(19)과 접하면서 후단(19)을 하강시킨다.When the cylinder 15 is compressed, the guide ring 14 rotates about the shaft 13, and the guide ring stopper 13 installed on the opposite side to the cylinder 15 descends, and as shown in FIG. The rear end 19 is lowered while contacting the rear end 19 of the ring now removing device 17.

후단(19)이 하강하면 도 2에 도시된 바와 같이 다관절 구조로 이루어진 개스포트링 지금 제거장치(17)의 선단(18)이 하강하여 개스포트링(3)의 내부에 부착된 지금을 로 내부로 떨어뜨려 제거한다.When the rear end 19 is lowered, as shown in FIG. 2, the tip 18 of the gasket ring elimination device 17 having a multi-joint structure is lowered and is now attached to the inside of the gasket ring 3. Drop it inside to remove it.

다음, 실린더(15)를 작동하여 인장시키면 가이드링(14)이 축(13)을 중심으로 회동하여, 실린더(15)와 반대측에 설치된 가이드링 스토퍼(16)가 상승하여 절개부 중량추(12)와 접하면서 중량추(12)를 상승시킨다.Next, when the cylinder 15 is operated and tensioned, the guide ring 14 rotates about the shaft 13, and the guide ring stopper 16 installed on the opposite side to the cylinder 15 rises to raise the cut weight 12. ) And the weight 12 is raised.

절개부 중량추(12)가 상승되면 절개부(10)가 곡관부(4)의 내부로 삽입되고, 이로 인해 곡관부(4)의 내벽에 부착된 지금이 로의 내부로 떨어지면서 제거된다.When the incision weight 12 is raised, the incision 10 is inserted into the inside of the bend part 4, whereby the now attached to the inner wall of the bend part 4 falls to the inside of the furnace and is removed.

이와 같이, 실린더(15)를 압축하고 인장하는 1회 작동으로 개스포트링(3) 및 곡관부(4)에 부착된 지금이 동시에 제거된다.In this way, the now attached to the gasket ring 3 and the bent portion 4 in a single operation of compressing and tensioning the cylinder 15 is simultaneously removed.

상기한 바와 같이, 본 발명에 따른 전기로 루프의 개스포트링 및 곡관부에 부착된 지금 제거장치를 이용하면 개스포트링 및 곡관부에 부착된 지금을 수시로 제거해주므로 집진 효율이 향상되어 환경오염이 방지되는 효과가 있다.As described above, by using the now removing device attached to the gasket ring and the bent portion of the electric furnace loop according to the present invention, the dust attached to the gasket ring and the bent portion is removed from time to time, so that the dust collection efficiency is improved. There is an effect that is prevented.

또한, 과다한 지금 부착에 의한 중량 증가로 전기로 루프의 개, 폐를 위한 회전설비가 파손되는 일이 방지되고 설비파손에 의한 사고를 방지하는 효과가 있다.In addition, due to the excessive weight increase due to the now attached to prevent the damage of the rotary equipment for opening and closing the loop of the furnace, there is an effect of preventing the accident due to equipment damage.

Claims (1)

곡관부의 지금이 융착되는 부위의 절개된 위치에 하측이 힌지결합된 절개부;An incision hinged to the lower side at an incision position of a portion where the bend of the bend is fused; 상기 곡관부에 연결되어 상기 절개부가 이탈하지 않도록 지지하는 절개부 지지대;An incision support that is connected to the bend and supports the incision so that it is not separated; 상기 절개부의 외면에 부착되어 상기 절개부를 상기 곡관부의 내부로 전후진시키는 절개부 중량추;An incision weight which is attached to an outer surface of the incision to advance the incision back and forth into the bent portion; 상기 절개부 중량추의 하부에서 상기 곡관부를 감싸면서 축으로 연결되고, 상기 축을 중심으로 회동운동하며, 일측에 돌출된 가이드링 스토퍼가 고정된 가이드링;A guide ring connected to the shaft while surrounding the curved pipe portion at the lower portion of the incision weight, rotating around the shaft, and having a guide ring stopper protruding from one side; 상기 가이드링의 타측에 부착되어 상기 가이드링이 회동하도록 구동하는 실린더; 및A cylinder attached to the other side of the guide ring to drive the guide ring to rotate; And 전기로 루프의 상면에 설치되고, 개스포트링 상부에 위치하는 선단과 가이드링 스토퍼 하부에 위치하는 후단을 포함하는 다관절 구조로 이루어진 개스포트링 지금 제거장치를 포함하는 전기로 루프의 개스포트링 및 곡관부에 부착된 지금 제거장치.A gasket ring of an electric furnace loop including a gasket ring now removing device which is installed on an upper surface of the furnace loop and includes a leading end positioned above the gasket ring and a rear end positioned below the guide ring stopper. And a now removing device attached to the bend.
KR1019990065308A 1999-12-29 1999-12-29 Device for removing slag attached in gas pot ring and elbow of electric furnace KR20010065422A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020052888A (en) * 2000-12-26 2002-07-04 이구택 Device for Gas port ring of electro furnace
KR100617256B1 (en) * 2005-10-12 2006-08-29 주식회사 포스코 Electric arc furnace with the roof improved weight balance
KR100694813B1 (en) * 2001-05-03 2007-03-13 주식회사 포스코 Apparatus for gathering iron oxide at curved part of dust collection duct in electric furnace
KR100792744B1 (en) * 2001-07-16 2008-01-11 주식회사 포스코 Dust collectible duct cumulative dust automatic discharging apparatus
KR100983897B1 (en) * 2003-05-29 2010-09-27 주식회사 포스코 Device for removing slag of gas port ring in electro furnace
KR101022438B1 (en) * 2003-08-19 2011-03-15 주식회사 포스코 Device for cleaning elbow of electro furnace
KR101136225B1 (en) * 2004-12-27 2012-04-17 주식회사 포스코 Movable sleeve for cleaning of electric frunace

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020052888A (en) * 2000-12-26 2002-07-04 이구택 Device for Gas port ring of electro furnace
KR100694813B1 (en) * 2001-05-03 2007-03-13 주식회사 포스코 Apparatus for gathering iron oxide at curved part of dust collection duct in electric furnace
KR100792744B1 (en) * 2001-07-16 2008-01-11 주식회사 포스코 Dust collectible duct cumulative dust automatic discharging apparatus
KR100983897B1 (en) * 2003-05-29 2010-09-27 주식회사 포스코 Device for removing slag of gas port ring in electro furnace
KR101022438B1 (en) * 2003-08-19 2011-03-15 주식회사 포스코 Device for cleaning elbow of electro furnace
KR101136225B1 (en) * 2004-12-27 2012-04-17 주식회사 포스코 Movable sleeve for cleaning of electric frunace
KR100617256B1 (en) * 2005-10-12 2006-08-29 주식회사 포스코 Electric arc furnace with the roof improved weight balance

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