KR20020001388A - Refractory brick for a converter - Google Patents

Refractory brick for a converter Download PDF

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Publication number
KR20020001388A
KR20020001388A KR1020000036067A KR20000036067A KR20020001388A KR 20020001388 A KR20020001388 A KR 20020001388A KR 1020000036067 A KR1020000036067 A KR 1020000036067A KR 20000036067 A KR20000036067 A KR 20000036067A KR 20020001388 A KR20020001388 A KR 20020001388A
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KR
South Korea
Prior art keywords
refractory
converter
refractory bricks
iron plate
steel plates
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KR1020000036067A
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Korean (ko)
Inventor
강희성
박재곤
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이구택
포항종합제철 주식회사
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Priority to KR1020000036067A priority Critical patent/KR20020001388A/en
Publication of KR20020001388A publication Critical patent/KR20020001388A/en

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    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/12—Shells or casings; Supports therefor
    • F27B1/14—Arrangements of linings
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/004—Linings or walls comprising means for securing bricks

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

PURPOSE: A refractory brick for a converter is provided which solidly supports and maintains construction structure of refractory bricks even to mechanical impact, and shuts off air inflow into the backside of the refractory bricks from the outside by restraining crack in refractory bricks. CONSTITUTION: In refractory bricks constructed in the furnace port of a converter, the refractory bricks for the converter are characterized in that steel plates(20) are adhered to at least one side corner of the converter in a length direction of the refractory bricks(12), wherein the steel plates are adhered to the refractory bricks with a plurality of protrusions being projected from the inner surface of the steel plates so as to improve bonding force between the steel plates and the refractory bricks, and wherein the steel plates are general structural rolled steel having a thickness of 1 to 2 mm, and a width of 90% or less of widths of one side of the refractory bricks.

Description

전로용 내화연와{Refractory brick for a converter}Refractory brick for a converter}

본 발명은 제강공정의 전로에 관한 것으로, 특히 전로의 노구에 축조되는 내화연화에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to converters in a steelmaking process, and more particularly to refractory softening built up in furnace furnaces.

일반적으로 전로는 고로에서 생산된 용선을 용강으로 제강하기 위하여 사용되며, 도 6에서 도시된 바와 같이 철피(100) 내측으로는 영구장연와(110)와 내화연와(120)의 순서로 연와가 축조되어 있다. 이러한 연와는 정련작업시 용강 및 슬래그에 대한 고내식성을 유지시키기 위한 것으로 불소성 마그네시아 카본질(MgO-C)의 연와가 주로 사용되고 있다.In general, the converter is used to steelmaking molten iron produced in the blast furnace by molten steel, and as shown in Figure 6 the inner side of the steel bar 100 in the order of the permanent long (110) and fire retardant (120) is built in the order have. These ducts are used to maintain high corrosion resistance against molten steel and slag during refining operations. Fluorine magnesia carbonaceous (MgO-C) ducts are mainly used.

여기서 전로는 항아리 모양으로 전로의 상부에 위치하는 노구는 철피가 노체 안쪽으로 경사진 구조로서 내화연와 또한 항아리 모양으로 축조되어 있으며, 전로 가동중에 부착된 지금은 하루 2-3회 정도로 분리, 제거하게 된다.The furnace is located in the shape of a jar and is located in the upper part of the converter. The structure of the furnace is inclined to the inside of the furnace. The furnace is constructed in the shape of fire-resistant smoke and also in the shape of a jar. do.

지금의 분리 제거작업은 도 6에 도시된 바와 같이, 전로를 90°회전시켜 옆으로 뉘운 후 고철장입슈트(150)와 천장크레인을 이용하여 전로의 입구쪽에 기계적인 충격을 가하여 실시하게 되는 데, 이 과정에서 분리되는 지금과 함께 내화연와가 동반 탈락되고, 지금 제거시 충격으로 인해 내화연와의 연결 틈새 부위가 넓어지거나 이완되는 현상이 발생된다.As shown in FIG. 6, the separation and removal work is carried out by applying a mechanical shock to the inlet of the converter using the scrap metal loading chute 150 and the ceiling crane after the converter is rotated by 90 ° to the side. In this process, the fire retardant wand is dropped off together with the now separated, and the phenomenon of widening or relaxation of the connection gap with the fire retardant occurs due to the impact upon removal.

또한, 마그네시아 카본질 내화연와의 최대 약점은 탄소의 산화로서 이것은 내화연와의 물성을 급격히 하락시켜 과다한 침식발생의 요인으로 작용한다.In addition, the biggest weakness with the magnesia carbonaceous refractory lead is the oxidation of carbon, which drastically lowers the physical properties with the refractory lead, thereby causing excessive erosion.

대기중의 공기가 전로 가동중에 전로 내부로 유입되면 공기중의 산소가 내화연와의 확장 이완된 입구 틈새로 유입되면서 내화연와의 성분 중 탄소와 반응하게 되고, 용강정련의 과정중에 발생된 슬래그 중에 포함된 철,망간,크롬 등의 산화물이 입구 틈새로 유입되면서 내화연와의 탄소를 기화시키는 주요 원인이 되는 것이다.When the air in the air flows into the converter during the operation of the converter, the oxygen in the air flows into the relaxed inlet gap with the refractory lead and reacts with the carbon in the component of the refractory lead, which is included in the slag generated during the molten steel refining process. Oxides such as iron, manganese, and chromium are introduced into the gaps of the inlet, which is a major cause of vaporizing carbon with refractory lead.

상기 반응이 마그네시아 카본질 내화연와의 가동면보다 배면부에서의 반응이 더욱 활발한 것은 전로 가동중에 부착된 지금 제거 작업시의 물리적인 충격으로 발생된 노 입구의 내화연와간의 틈새가 발생하기 때문으로, 이 부위로 공기의 유입이 계속되고 탄소의 배면산화가 지속적으로 진행되는 것이다.The reaction is more active at the back side than the movable surface with the magnesia carbonaceous fire retardant because the gap between the fire inlet of the furnace inlet generated by the physical impact during the removal operation attached to the converter during operation is generated. The inflow of air continues and the backside oxidation of carbon continues.

전로의 사용횟수가 증가할수록 전로 입구의 내화연와의 배면산화가 심해져 강도가 떨어지고 이와 더불어 내화연와로서의 기능저하로 작은 충격에도 쉽게 탈락 붕괴되거나 용강 정련시 급속한 침식을 유발시킴으로서 용강 유출의 위험성으로 안정조업에 지장을 초래하며 열간보수에 필요한 물량을 증가시키는 문제점이 발생된다.As the number of converters used increases, the back oxidation with the refractory smoke at the entrance of the converter becomes more severe, and the strength decreases. In addition, its function as a refractory smoke decreases easily due to its low impact. There is a problem that causes a problem to increase the amount required for hot repair.

이에 본 발명은 상기와 같은 제반 요구사항에 부응하기 위하여 안출된 것으로, 전로 가동중 지금 제거 작업시 기계적인 충격에도 내화연와의 축조구조를 견고히 지지 유지할 수 있고 내화연와간의 틈새 발생을 억제시켜 외부로부터 내화연와의 배면부로 공기 유입을 차단시킬 수 있도록 된 전로의 내화연와를 제공함에 그 목적이 있다.Therefore, the present invention was devised to meet the above requirements, and it is possible to firmly support the construction structure with the refractory smoke even in the mechanical impact during the removal operation during converter operation, and to suppress the occurrence of the gap between the refractory smoke from the outside. It is an object of the present invention to provide a flame retardant of the converter that can block the inflow of air to the rear portion of the refractory.

도 1은 일반적인 전로설비의 철피 및 내화연와의 축조구조를 도시한 단면도,1 is a cross-sectional view showing the construction structure of the bark and refractory smoke of a typical converter facility,

도 2는 본 발명에 따라 내화연와가 축조된 노 입구를 도시한 단면도,2 is a cross-sectional view showing a furnace inlet of the refractory smoked wa in accordance with the present invention,

도 3은 본 발명에 따라 메탈케이스가 부착된 내화연와를 도시한 사시도,3 is a perspective view showing a fire retardant with a metal case attached in accordance with the present invention;

도 4는 본 발명에 따른 메탈케이스만을 도시한 사시도,4 is a perspective view showing only a metal case according to the present invention;

도 5는 본 발명에 따른 내화연와가 축조된 상태를 도시한 도면,5 is a view showing a state in which the refractory lead is constructed in accordance with the present invention;

도 6은 종래기술에 따라 축조된 내화연와가 슬래그 제거작업시 탈락되는 상태를 도시한 도면이다.Figure 6 is a view showing a state in which the refractory smoke rolls constructed according to the prior art is dropped during the slag removal operation.

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

10 : 철피 11 : 영구연와10: bar 11 11: permanent smoke

12 : 내화연와 13 : 마우스링12: fireproof smoke and 13: mouse ring

20 : 철판 21 : 돌기20: iron plate 21: projection

상기한 바와 같은 목적을 달성하기 위하여 본 발명은, 내화연와 제조시 철판을 삽입하여 제조함으로서 용강정련시 발생되는 고열에 의해 철판과 내화연와가 반응하여 견고히 맞물리도록 함에 그 특징이 있다.In order to achieve the object as described above, the present invention is characterized in that the iron plate and the refractory smoke reacts with each other by a high temperature generated during refining molten steel by inserting the iron plate during manufacturing and refractory lead.

이하 본 발명의 일실시예를 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 일반적인 전로설비의 철피 및 내화연와의 축조구조를 도시한 단면도이고, 도 2는 본 발명에 따라 내화연와가 축조된 노 입구부를 도시한 단면도이며, 도 3은 본 발명에 따라 메탈케이스가 부착된 내화연와를 도시한 사시도이다.1 is a cross-sectional view showing the construction structure of the bark and the refractory smoke of a typical converter facility, Figure 2 is a cross-sectional view showing a furnace inlet portion of the refractory smoke is formed in accordance with the present invention, Figure 3 is a metal case in accordance with the present invention It is a perspective view which shows the attached fireproof lead.

상기한 도면에 의하면, 전로는 항아리 형상을 이루므로 전로의 상부에 위치하는 입구는 철피(10)가 노체 안쪽으로 경사진 구조로 되어 있고 입구 외측으로 마우스링(13)이 설치되며, 전로 내부에는 영구연와(11)와 내화연와(12)가 축조된다.According to the above drawings, the converter has a jar shape, so the inlet located in the upper part of the converter has a structure in which the shell 10 is inclined into the furnace body, and a mouth ring 13 is installed outside the inlet. The permanent lead 11 and the fire resistant lead 12 are constructed.

여기서 본 발명의 내화연와(12)는 마그네시아 카본질의 내화연와(12)를 제조할 때 ㄴ자형 철판(20)을 금형 내부에 삽입하고 원료를 채운 다음 대형 프레스로 압축시켜 연와의 일측 외측면이 철판(20)을 이루도록 함에 그 특징이 있다.Here, the refractory wire (12) of the present invention, when manufacturing the magnesia carbonaceous refractory wire (12) is inserted into the N-shaped iron plate 20 into the mold and filled with the raw material and then compressed by a large press to the one side of the outer side of the iron plate It is characterized by achieving (20).

부착된 철판(20)은 도 4에 도시된 바와 같이, ㄴ자형으로 이루어지고 내화연와(12)와의 결합력을 향상시키기 위하여 철판(20)의 내측면에는 돌기(21)가 다수개 돌출된 구조로 되어, 돌기(21)가 돌출된 면은 내화연와(12)의 내부에 삽입되고, 외측면은 내화연와(12)의 표면에 부착되어진다.As shown in FIG. 4, the attached iron plate 20 is formed in a N-shape and has a structure in which a plurality of protrusions 21 protrude from the inner surface of the iron plate 20 in order to improve bonding force with the refractory lead 12. As a result, the surface on which the protrusion 21 protrudes is inserted into the refractory foil 12, and the outer surface is attached to the surface of the refractory foil 12.

상기 철판(20)은 일반 구조용 압연강재로 제작되며, 두께는 1 - 2 mm 이고 그 한쪽 폭은 내화연와의 일 측 폭의 90% 이하로 하여 내화연화를 제조하는 과정 중에 프레스작업에 방해가 되지 않도록 하는 것이 바랍직하다.The iron plate 20 is made of a general structural rolled steel, the thickness is 1-2 mm and one side width is less than 90% of the width of one side with the refractory lead does not interfere with the press work during the manufacture of refractory softening. It is advisable not to.

철판(20)은 ㄴ자형으로 사각육면체인 연와에 대해 두면에만 부착설치되는 데 그이유는, 철판(20)과 내화연와(12)간의 열간 선팽창율이 다르기 때문으로 MgO-C연와의 두면 이상을 철판(20)으로 케이스화시켰을 경우 고온에서 상호 팽창을 저해하는 관계로 내화물의 스폴링(spalling)발생을 초래하여 이상 침식을 발생케 하는 원인이 될 수 있으므로 상호 팽창을 구속치 않는 연와의 두면에만 철판(20)을 부착시킨다.The iron plate 20 is N-shaped and is attached to only two surfaces with respect to the rectangular hexahedron because the hot linear expansion coefficient between the iron plate 20 and the refractory lead 12 is different. If the case is made of iron plate 20, the expansion of the refractory may be caused by spalling of the refractory, which may cause abnormal erosion. The iron plate 20 is attached.

또한, 도 5에 도시된 바와 같이 전로의 축조구조는 적층구조로 이루어짐으로 사각육면체인 연와의 4개 측면 중에 ㄴ자형이나 ㄱ자형태의 철판(20)이 설치된 연와를 계속적으로 축조하면 결과적으로 연와가 접하는 4개면 모두에 철판(20)이 접하게 되어 모든 면에 철판(20) 부착한 연와와 동일한 효과를 얻을 수 있기 때문이다.In addition, as shown in Figure 5, the structure of the converter is made of a laminated structure of the four sides of the rectangular hexahedron of the yeonjab is formed as a result of continuous construction of the yeonwa provided with the iron plate (20) of the c-shaped or L-shape as a result This is because the iron plate 20 is in contact with all four surfaces in contact with each other, so that the same effect as that of the lead attached to the iron plate 20 on all surfaces can be obtained.

철판(20)과 내화연와(12)의 화학적 반응에 대해 설명하면, 제강 전로의 슬래그 성분은 CaO 40-45%, SiO210-13%, MgO 8-10%의 조성을 보이며, 전로 취련중에 반응이 일어난다. 이때 슬래그 중의 MgO와 상기 반응물인 Fe2O3가 반응하게 된다.Referring to the chemical reaction between the iron plate 20 and the refractory lead 12, the slag component of the steelmaking converter exhibits a composition of CaO 40-45%, SiO 2 10-13%, and MgO 8-10%, and reacts during the converter blowing. This happens. At this time, MgO in the slag and Fe 2 O 3 which is the reactant react.

결국 통상의 조업조건(전로 화점온도 2200℃, 종점온도 1680-1750℃)에서는 MgO, Fe2O3는 준용융(semi melting)된 상태로 연와와 융착된 상태를 보인다.As a result, MgO and Fe 2 O 3 are fused with lead in a semi-melted state under normal operating conditions (converter firing point temperature 2200 ° C, end point temperature 1680-1750 ° C).

상기 반응에서 준용융된 철판(20)은 연와의 틈새부위에 잔류하게 됨으로 연와와의 결속력을 증대시키고 따라서 전로 조업시 경동 및 고철제거시 연와의 이완, 탈락 등을 막아주게 된다. 따라서 이완 및 탈락이 줄어들면서 연와면 사이로 들어가는 공기의 침투를 차단하게 되고 배면 산화를 근본적으로 감소시킬 수 있게 된다.In the reaction, the semi-molten iron plate 20 remains in the gap of the lead, thereby increasing the binding force of the lead and thus preventing the loosening and dropping of the lead during tilting and removal of scrap metal during the converter operation. As a result, relaxation and dropout are reduced, which blocks the penetration of air between the soft and soft surfaces and can fundamentally reduce back oxidation.

즉, 전로 슬래그 제거 작업시 충격이 가해지는 입구에 축조된 철판이 부착된 내화연와(12)는 가동(용강정련시)시 발생되는 고열에 의해 슬래그의마그네시아(MgO)성분과 철판(20)의 철산화물(FeO,Fe2O3)이 1000°이상에서 반응하여 반응물층(MgO-FeO, MgO-Fe2O3)을 생성하게 되고, 이 생생물은 내화연와(12)의 틈새를 중심으로 그물망처럼 연결되어 내화연와(12)간 상호 견고한 구조를 형성하게 됨으로서 주기적으로 실시되는 지금제거 작업시의 충격발생에도 내화연와(12)의 탈락 및 붕괴현상을 방지할 수 있게 되는 것이다.In other words, the refractory smoked wire 12 having the iron plate constructed at the inlet to which the impact is applied during the removal of the converter slag is caused by the high temperature generated during the operation (during molten steel) of the slag magnesia (MgO) component and the iron plate 20 Iron oxides (FeO, Fe 2 O 3 ) is reacted at 1000 ° or more to form a reactant layer (MgO-FeO, MgO-Fe 2 O 3 ), the living organisms are centered on the gap between the fire retardant (12) Connected like a mesh to form a mutually robust structure between the fire reed (12) and to prevent the fall and collapse of the fire reed (12) even in the event of a shock during the periodic removal now performed.

이상 설명한 바와 같은 본 발명에 따른 전로의 내화연와에 의하면, 내화연와간의 연결구조를 견고히 하여 구조적 안정을 도모함으로서 충격에 의한 탈락을 방지할 수 있다.According to the refractory smoke of the converter according to the present invention as described above, it is possible to prevent the dropping by the impact by strengthening the connection structure between the fire retardant and structural stability.

또한, 내화연와의 연결부의 이완현상을 방지하여 틈새발생을 억제시킴으로서 공기의 유입을 차단하여 내화연와의 배면산화를 방지할 수 있게 된다.In addition, it is possible to prevent the back oxidation of the refractory smoke by blocking the inflow of air by preventing the occurrence of the gap by preventing the loosening phenomenon of the connection portion with the refractory smoke.

Claims (3)

전로의 노구에 축조되는 내화연화에 있어서,In the refractory softening built in the furnace ward of the converter, 상기 내화연와의 길이방향의 적어도 한쪽 모서리에 철판이 부착되어 제조된 것을 특징으로 하는 전로용 내화연와.Refractory smoke for the converter characterized in that the iron plate is attached to at least one edge in the longitudinal direction of the refractory smoke. 제 1 항에 있어서, 상기 철판은 ㄴ자형으로 이루어지고 내화연와와의 결합력을 향상시키기 위하여 철판의 내측면에는 돌기가 다수개 돌출되어 내화연와에 부착설치된 것을 특징으로 하는 전로용 내화연와.According to claim 1, wherein the iron plate is made of N-shaped and in order to improve the bonding force with the refractory fire retardant for the converter, characterized in that a plurality of protrusions protruded on the inner surface of the iron plate is attached to the fire retardant. 제 1 항 또는 제 2 항에 있어서, 상기 철판은 일반 구조용 압연강재로서 두께가 1 - 2 mm 이며 폭은 내화연와의 일 측 폭의 90% 이하인 것을 특징으로 하는 전로용 내화연와.The fire retardant foil for converter according to claim 1 or 2, wherein the iron plate is a general structural rolled steel having a thickness of 1-2 mm and a width of 90% or less of one side width of the refractory lead.
KR1020000036067A 2000-06-28 2000-06-28 Refractory brick for a converter KR20020001388A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104613774A (en) * 2015-01-16 2015-05-13 济南大学 Refractory brick for straight section of cyclone
KR20160064282A (en) 2014-11-27 2016-06-08 주식회사 포스코 Method for control of furnace

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54131552U (en) * 1978-03-03 1979-09-12
JPS5522100U (en) * 1978-08-01 1980-02-13
JPS57198982A (en) * 1981-05-25 1982-12-06 Asea Ab Lining for arc furnace
JPS5980695U (en) * 1982-11-25 1984-05-31 川崎炉材株式会社 Fireproof insulation brick for kiln

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54131552U (en) * 1978-03-03 1979-09-12
JPS5522100U (en) * 1978-08-01 1980-02-13
JPS57198982A (en) * 1981-05-25 1982-12-06 Asea Ab Lining for arc furnace
JPS5980695U (en) * 1982-11-25 1984-05-31 川崎炉材株式会社 Fireproof insulation brick for kiln

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160064282A (en) 2014-11-27 2016-06-08 주식회사 포스코 Method for control of furnace
CN104613774A (en) * 2015-01-16 2015-05-13 济南大学 Refractory brick for straight section of cyclone

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