KR20080051115A - Duct for an electric furnace - Google Patents

Duct for an electric furnace Download PDF

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Publication number
KR20080051115A
KR20080051115A KR1020080015753A KR20080015753A KR20080051115A KR 20080051115 A KR20080051115 A KR 20080051115A KR 1020080015753 A KR1020080015753 A KR 1020080015753A KR 20080015753 A KR20080015753 A KR 20080015753A KR 20080051115 A KR20080051115 A KR 20080051115A
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KR
South Korea
Prior art keywords
inner tube
duct
electric furnace
pipe
tube
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KR1020080015753A
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Korean (ko)
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김성기
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김성기
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Priority to KR1020080015753A priority Critical patent/KR20080051115A/en
Publication of KR20080051115A publication Critical patent/KR20080051115A/en

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    • 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
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/002—Details of the installations, e.g. fume conduits or seals
    • 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
    • F27B3/19—Arrangements of devices for discharging
    • 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
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/003—Extraction of waste gases, collection of fumes and hoods used therefor of waste gases emanating from an electric arc furnace
    • 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
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

A duct for an electric furnace is provided to enhance endurance life the welds by removing weak welds directly coming in contact with a path through which gas with a high temperature passes in a duct with structure of a water cooled double pipe. A duct for an electric furnace comprises: an outer tube(3) having connecting flanges(1) formed on both ends thereof and pipes(2) installed on both end sides thereof; an inner tube(4) inserted into the outer tube to form a space part between the inner and outer tubes; a spiral plate(5) spirally installed in the space part between the inner and outer tubes to form a pipeline through which cooling water flows; and inner tube end flanges(6) installed on both ends of the inner and outer tubes to seal the space part through which cooling water flows, wherein the inner tube end flanges are formed by bending both ends of the inner tube to the outer side, and the inner tube end flanges are integrally formed by welds(7) of which end portions are welded to edges of end portions of the outer tube. The inner tube has bending grooves formed on inner portions thereof on which the inner tube end flanges are bent so as to bend the inner tube end flanges easily.

Description

전기로용 덕트{Duct for an electric furnace}Duct for an electric furnace

본 발명은 전기로에서 발생되는 고온의 가스를 배출하는 덕트에 관한 것으로, 수냉을 위한 이중 벽의 구조를 가진 덕트의 내관의 양단 주연부를 절곡시켜 내관 단부 플랜지를 형성시킴으로써, 용접으로 내관과 외관의 양단부를 밀폐하던 종래의 구조에서 발생하던 용접부 파열의 문제점을 해소한 발명에 관한 것이다.The present invention relates to a duct for discharging high-temperature gas generated in an electric furnace, by bending the peripheral edges of both ends of the inner tube of the duct having a double-wall structure for water cooling to form an inner tube end flange, the both ends of the inner tube and the exterior by welding It relates to an invention that solves the problem of rupture of the weld that occurred in the conventional structure to seal the.

제강 공장의 전기로에서는 제철 원료와 첨가제 등이 고온에서 용융되면서, 분진과 고온의 배출 가스가 발생하게 된다. 이와 같은 분진을 포함한 고온의 배출 가스는 1,000℃ 이상이므로, 이를 배출하는 관로의 덕트는 일반적인 구조가 아닌 수냉식 이중관의 구조를 가진다. 따라서 전기로에서 배출되는 가스 등은 덕트를 거치면서 냉각되어 집진기로 송출되고, 집진기에서 분진 등이 걸러져 깨끗한 공기만이 대기로 배출된다.In an electric furnace of a steelmaking factory, raw materials and additives such as steel are melted at high temperatures, and dust and hot exhaust gases are generated. Since high-temperature exhaust gas including such dust is 1,000 ° C. or more, the duct of the pipe for discharging it has a structure of a water-cooled double pipe rather than a general structure. Therefore, the gas discharged from the electric furnace is cooled while passing through the duct is sent to the dust collector, the dust is filtered out of the dust collector, and only clean air is discharged to the atmosphere.

종래의 이중관 덕트(100)의 구조는 도 4(a)(b)와 같이 일정 길이의 내관(4)과 외관(3)으로 구성되고, 내관(4)의 외측과 외관(3)의 내측이 형성하는 공간에 나 선판(5)이 설치되어 냉각수가 내관(4)의 외측을 따라 나선형으로 흐를 수 있도록 된 구조이다. 그리고 내관(4)과 외관(3)의 양단부는 밀폐를 하여야 하므로 원형 고리판(10)의 내외측 가장자리를 각각 내관(4)과 외관(3)의 가장자리와 용접으로 일체화시켰다. 그리고 외관의 양단부에는 연결 플랜지(1)를 설치하여 다른 냉각용 덕트를 다수 개 연결하여 사용할 수 있는 구조로 되어 있다.The structure of the conventional double tube duct 100 is composed of a predetermined length of the inner tube 4 and the exterior 3, as shown in Fig. 4 (a) (b), the outer side of the inner tube 4 and the inside of the exterior 3 The spiral plate 5 is installed in the space to be formed so that the cooling water can flow helically along the outer side of the inner tube 4. Both ends of the inner tube 4 and the outer tube 3 should be sealed, so that the inner and outer edges of the circular annular plate 10 were integrated with the edges of the inner tube 4 and the outer tube 3 by welding. And both ends of the exterior is provided with a connecting flange (1) has a structure that can be used to connect a number of different cooling ducts.

따라서 종래의 경우는 용접부(7)가 고온의 배출 가스가 지나는 통로 즉 내관의 내측면으로 노출된 상태가 된다. 전기로에서 생성되는 가스는 부식성 가스인 SOx, NOx, HCl 등이고, 가스에 포함된 분진 등이 내관(4)의 벽면은 물론이고 용접부(7)에 마찰되므로, 용접부(7)의 부식과 마모가 급격히 진행되어, 종래의 덕트는 그 내구수명이 매우 짧은 문제점이 있었다.Therefore, in the conventional case, the welded portion 7 is exposed to a passage through which the hot exhaust gas passes, that is, the inner surface of the inner tube. Gases generated in the electric furnace are SOx, NOx, HCl, etc., which are corrosive gases, and the dust and the like contained in the gas rub against the welded portion 7 as well as the wall surface of the inner tube 4, so that corrosion and wear of the welded portion 7 are rapidly increased. Proceeding, the conventional duct has a problem that its durability is very short.

이와 같이 용접부(7)에 특히 내구수명이 짧아지는 것은, 용접에 의해 내외관의 물성이 변화되고, 용접재와 내외관의 재질의 사이에 층이 형성되는 등의 문제에 의하게 된다.Thus, the shortening of the durability life especially in the welding part 7 is caused by the problem that the physical property of an internal and external appearance changes by welding, and a layer is formed between a welding material and the material of an internal and external exterior.

그리고 이와 관련하여 도 4(a)와 같이 원형 고리판(10)의 단부와 내관(4)이 각을 이루는 형상이 되어, 흐르는 가스와 분진에 의해 충격이 가해지게 되어 더욱더 용접부(7)의 손상이 가속되었다. 따라서 도 4(b)와 같이 원형 고리판(10)의 단면 구조를 호형으로 하여, 내관(4)과 연결되는 용접부(7)의 형상이 완만한 곡률을 가지도록 하여 흐르는 가스와 분진에 의한 충격을 완화하는 구조가 개발되었다. 그러나 이 또한 용접부(7)가 고온의 가스가 지나는 통로에 직접 노출되는 구조이므로 내구 수명의 연장에 큰 효과가 없다.In this connection, as shown in FIG. 4 (a), the end portion of the circular ring plate 10 and the inner tube 4 are angular, and the impact is caused by the flowing gas and dust, further damaging the weld 7. This was accelerated. Therefore, the cross-sectional structure of the circular ring plate 10 as shown in Figure 4 (b) arc-shaped, the shape of the weld portion 7 is connected to the inner tube 4 has a gentle curvature, the impact of gas and dust flowing A structure has been developed to mitigate the problem. However, since the welded portion 7 is directly exposed to the passage through which the hot gas passes, there is no significant effect in extending the durability life.

본 발명은 수냉 이중관의 구조를 가진 덕트에서 고온의 가스가 지나는 경로상에 직접 접촉되는 용접부를 제거하여 취약한 용접부의 내구 수명을 증대시키는 구조를 제공함에 목적이 있다.It is an object of the present invention to provide a structure for increasing the service life of a vulnerable weld by removing a weld directly contacting a path through which hot gas passes in a duct having a structure of a water-cooled double pipe.

상기의 목적을 달성하기 위하여 종래 원형 고리판을 제거하여 용접부를 제거하게 된다. 즉, 내관의 양단부를 외측으로 절곡하여 내관 단부 플랜지를 형성시켜 종래의 원형 고리판의 역할을 하도록 하고, 내관 단부 플랜지의 가장자리만을 외관에 용접함으로써, 가스가 직접 흐르는 부분에 용접부가 없도록 하여 내구 수명을 증대시키게 된다.In order to achieve the above object, the conventional circular ring plate is removed to remove the weld. That is, by bending both ends of the inner tube to the outside to form an inner tube end flange to serve as a conventional circular annular plate, and by welding only the edge of the inner tube end flange to the exterior, there is no weld in the portion where the gas flows directly Will be increased.

이와 같이 본 발명은 고온의 배출 가스가 흐르면서 강한 마찰과 열적 충격을 직접적으로 줄 수 있는 부분에 용접부를 제거하고, 용접에 의해 일체화되는 구성 부분을 줄임으로써, 열적 충격에 약한 용접부가 제거되어 내구 수명이 증대되는 효과가 있다.As described above, the present invention removes the welded portion at the part which can directly give strong friction and thermal shock while the high-temperature exhaust gas flows, and reduces the welded part that is integrated by welding, thereby eliminating the welded part which is weak to thermal shock, thereby increasing the service life. This has the effect of increasing.

본 발명은 양단부에 연결 플랜지(1)가 형성되고, 양단부측에 관통되게 파이프(2)가 설치된 외관(3); 외관(3)의 내부에 삽입되어 외관(3)과의 사이에 공간부를 형성시키는 내관(4); 내관(4)과 외관(3) 사이의 공간부에 나선형으로 설치되어 냉각수가 흐르는 관로를 형성하는 나선판(5); 내관(4)과 외관(3)의 양단부에 설치되어 냉각수가 흐르는 공간부를 밀폐하는 내관 단부 플랜지(6);를 포함하여 구성된 전기로용 덕트를 개량한 것이다.The invention (3) is provided with a connecting flange (1) at both ends, and the pipe (2) is installed so as to penetrate at both ends; An inner tube 4 inserted into the exterior 3 to form a space portion between the exterior 3; A spiral plate 5 spirally installed in a space portion between the inner tube 4 and the outer tube 3 to form a conduit through which cooling water flows; It is an improvement of the duct for an electric furnace comprised including; the inner pipe end flange 6 which is provided in the both ends of the inner pipe 4 and the exterior 3, and seals the space part through which cooling water flows.

즉, 상기 내관 단부 플랜지(6)는 내관(4)의 양단부가 외측으로 절곡되어 형성되고, 끝단부가 외관(3)의 단부 가장자리와 용접된 용접부(7)에 의해 일체로 형성됨으로써, 내관(4)과 내관 단부 플랜지(6)의 연결부에 용접부(7)가 없이 매끄럽고 유연하게 연결됨으로써, 고온의 가스와 분진이 흐를 때 마찰력이나 열적 충격을 최소화시키는 구조에 특징이 있다.That is, the inner tube end flange 6 is formed by bending both ends of the inner tube 4 to the outside, and the inner end of the inner tube 4 is integrally formed by the weld 7 welded to the end edge of the outer tube 3. ) Is smoothly and flexibly connected to the connecting portion of the inner tube end flange 6 without the welding portion 7, thereby minimizing frictional force or thermal shock when hot gas and dust flow.

그리고 내관 단부 플랜지(6)가 절곡되는 내관(4)의 내측 부위에 절곡을 용이하게 하는 밴딩홈(8)이 형성될 수도 있다.In addition, a bending groove 8 may be formed at an inner portion of the inner tube 4 in which the inner tube end flange 6 is bent.

이와 같은 구조의 덕트(100)가 도 1에 도시되어 있고, 도 2와 도 3에 부분 상세가 도시되어 있다.A duct 100 of such a structure is shown in FIG. 1 and partial details are shown in FIGS. 2 and 3.

전기로에 설치되어 고온의 분진과 가스는 도 1의 덕트(100)의 일측에서 타측으로 이동된다. 물론 덕트(100)는 필요 갯수만큼 연결 플랜지(1)로 연결하여 사용되는 구조이다. 그리고 냉각을 위하여 일측의 파이프(2)로 냉각수를 주입하여 타측의 파이프(2)로 배출시키게 된다.The dust and gas of high temperature installed in the electric furnace are moved from one side of the duct 100 of FIG. 1 to the other side. Of course, the duct 100 is a structure that is used by connecting to the connecting flange (1) as necessary. Then, the cooling water is injected into the pipe 2 on one side for cooling and discharged to the pipe 2 on the other side.

가스는 내관(4)을 따라 흐르게 되고, 포함된 분진 등과 함께 내관의 벽면에 마찰을 발생시키고 또한 고온에 의한 열적 충격을 내관(4)에 가하게 된다. 가스가 흐를 때 냉각수는 내관(4)과 외관(3)의 사이 공간을 따라 흐르고, 상기 내관(4)과 외관(3)의 사이 공간부에 설치된 나선판(5)에 의해 형성된 나선 관로를 따라 흐르면서 가스의 열을 빼앗아 배출된다.The gas flows along the inner tube 4 and generates friction on the inner wall of the inner tube together with the contained dust and the like, and also exerts a thermal shock due to the high temperature on the inner tube 4. When the gas flows, the coolant flows along the space between the inner tube 4 and the outer tube 3, and along the spiral line formed by the spiral plate 5 provided in the space portion between the inner tube 4 and the outer tube 3. As it flows, it takes away heat from the gas and exhausts it.

고온의 가스는 내관(4)의 벽면을 따라 흐르면서, 도 2와 같이 덕트(100)와 덕트(100)의 연결 부분에서 내관(4)과 내관 단부 플랜지(6)의 연결부인 밴딩부(9)에 저항을 받은 후 다시 내관(4)의 벽면을 따라 흐르게 된다.The hot gas flows along the wall surface of the inner tube 4, and as shown in FIG. 2, the bending portion 9, which is a connection portion between the inner tube 4 and the inner tube end flange 6, at the connection portion between the duct 100 and the duct 100. After being resisted to flow again along the wall of the inner tube (4).

이 때 본 발명의 밴딩부(9)는 둥근 완만한 형상을 가지고 있으므로, 가스의 흐름에 큰 저항으로 작용하지 않고, 열적 충격 또한 완화시킬 수 있는 구조이다. 이에 비하여 종래의 경우에는 도 4에 도시된 바와 같이 각진 형상을 가짐으로써 큰 저항과 열적 충격을 받는 구조에 의해 내구 수명이 짧았다.At this time, since the bending portion 9 of the present invention has a rounded gentle shape, the bending portion 9 does not act as a large resistance to the flow of gas and can also mitigate thermal shock. On the contrary, in the conventional case, as shown in FIG. 4, the endurance life is short due to the structure that is subject to great resistance and thermal shock by having an angular shape.

뿐만 아니라 종래의 경우 각진 부분에 용접부(7)가 형성되어 있어, 열적 충격에 약한 용접부(7)가 손상되어 크랙 등의 파손이 발생되었으나, 본 발명은 도 3과 같이 내관(4)과 내관 단부 플랜지(6)의 연결부에 용접부(7)가 없는 구조이므로, 열적 충격에 약한 용접부(7)를 제거함으로써 내구 수명을 증대시키게 된다. 이와 같은 구조는 내관(4)의 양단부를 외측으로 절곡시킴으로써 가능하다.In addition, in the conventional case, the welded portion 7 is formed at an angled portion, and thus the welded portion 7 which is weak to thermal shock is damaged, resulting in breakage such as cracks. However, the present invention has an inner tube 4 and an inner tube end as shown in FIG. Since there is no welded portion 7 in the connection portion of the flange 6, the durability life is increased by removing the welded portion 7 which is vulnerable to thermal shock. Such a structure is possible by bending both ends of the inner tube 4 to the outside.

물론 내관 단부 플랜지(6)의 끝단 가장자리는 외관(3)에 용접으로 연결되어 용접부(7)를 형성하지만, 이의 위치는 가스가 흐르는 내관(4)의 내부에서 벗어난 외측 부분에 있으므로, 가스의 열적 충격에서 벗어나게 된다.Of course, the end edge of the inner tube end flange 6 is welded to the outer shell 3 to form a weld 7, but its position is at the outer portion away from the interior of the inner tube 4 through which the gas flows, so that the thermal I get out of shock.

도 1은 본 발명인 전기로용 덕트의 전체 상태도1 is an overall state of the present invention duct for electric furnace

도 2는 도 1의 "A"부 상세 단면도2 is a detailed cross-sectional view of portion “A” of FIG. 1.

도 3은 본 발명의 내관 단부 플랜지의 실시 예시도Figure 3 is an exemplary embodiment of the inner tube end flange of the present invention

도 4는 종래 덕트의 단면도4 is a cross-sectional view of a conventional duct

※ 도면의 주요 부분에 대한 부호의 설명※ Explanation of codes for main parts of drawing

1 : 연결 플랜지 2 : 파이프1: connection flange 2: pipe

3 : 외관 4 : 내관3: appearance 4: inner tube

5 : 나선판 6 : 내관 단부 플랜지5: spiral plate 6: inner tube end flange

7 : 용접부 8 : 밴딩홈7: welded portion 8: banding groove

9 : 밴딩부 10 : 원형 고리판9: banding portion 10: circular ring plate

100 : 덕트100: duct

Claims (2)

양단부에 연결 플랜지(1)가 형성되고, 양단부측에 관통되게 파이프(2)가 설치된 외관(3); 외관(3)의 내부에 삽입되어 외관(3)과의 사이에 공간부를 형성시키는 내관(4); 내관(4)과 외관(3) 사이의 공간부에 나선형으로 설치되어 냉각수가 흐르는 관로를 형성하는 나선판(5); 내관(4)과 외관(3)의 양단부에 설치되어 냉각수가 흐르는 공간부를 밀폐하는 내관 단부 플랜지(6);를 포함하여 구성된 전기로용 덕트에 있어서, 상기 내관 단부 플랜지(6)는 내관(4)의 양단부가 외측으로 절곡되어 형성되고, 끝단부가 외관(3)의 단부 가장자리와 용접된 용접부(7)에 의해 일체로 형성됨을 특징으로 하는 전기로용 덕트.A connection flange 1 formed at both ends, and the pipe 3 provided with a pipe 2 to penetrate both ends; An inner tube 4 inserted into the exterior 3 to form a space portion between the exterior 3; A spiral plate 5 spirally installed in a space portion between the inner tube 4 and the outer tube 3 to form a conduit through which cooling water flows; An inner pipe end flange (6) installed at both ends of the inner pipe (4) and the outer pipe (3) to seal a space through which cooling water flows, wherein the inner pipe end flange (6) is an inner pipe (4). Both ends of the electric duct is bent to the outside, the end is formed integrally by the welded portion (7) welded to the end edge of the exterior (3). 제 1항에 있어서, 내관 단부 플랜지(6)가 절곡되는 내관(4)의 내측 부위에 절곡을 용이하게 하는 밴딩홈(8)이 형성됨을 특징으로 하는 전기로용 덕트.2. The furnace duct according to claim 1, wherein a bending groove (8) is formed in an inner portion of the inner tube (4) where the inner tube end flange (6) is bent.
KR1020080015753A 2008-02-21 2008-02-21 Duct for an electric furnace KR20080051115A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101678077B1 (en) * 2016-06-13 2016-11-21 강성진 Water cooling module type dust duct of electric furnace
CN109593908A (en) * 2018-12-26 2019-04-09 苏州海陆重工股份有限公司 Flue connection structure
KR20210022291A (en) * 2019-08-20 2021-03-03 한국수력원자력 주식회사 Off-gas outlet for melter of Vitrification facility

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101678077B1 (en) * 2016-06-13 2016-11-21 강성진 Water cooling module type dust duct of electric furnace
CN109593908A (en) * 2018-12-26 2019-04-09 苏州海陆重工股份有限公司 Flue connection structure
KR20210022291A (en) * 2019-08-20 2021-03-03 한국수력원자력 주식회사 Off-gas outlet for melter of Vitrification facility

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