KR20020030938A - Device for nozzle pre-heating of tundish refractory - Google Patents

Device for nozzle pre-heating of tundish refractory Download PDF

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Publication number
KR20020030938A
KR20020030938A KR1020000061305A KR20000061305A KR20020030938A KR 20020030938 A KR20020030938 A KR 20020030938A KR 1020000061305 A KR1020000061305 A KR 1020000061305A KR 20000061305 A KR20000061305 A KR 20000061305A KR 20020030938 A KR20020030938 A KR 20020030938A
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KR
South Korea
Prior art keywords
tundish
fixed
nozzle
preheating
burner
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KR1020000061305A
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Korean (ko)
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KR100491120B1 (en
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조항균
한경대
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이구택
주식회사 포스코
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Priority to KR10-2000-0061305A priority Critical patent/KR100491120B1/en
Publication of KR20020030938A publication Critical patent/KR20020030938A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/60—Pouring-nozzles with heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal

Abstract

PURPOSE: A device for preheating a refractory nozzle of a tundish is provided to secure safety of continuous casting operation and produce high grade steel billets by uniformly preheating an immersion nozzle of the tundish so as to prevent partial oxidation thereof and preheating a tundish plate at the same time. CONSTITUTION: The device for preheating a refractory nozzle of a tundish comprises a guide(25) fixed to a base(30); a stand(26) which is slidingly installed along the guide(25) by a burner transferring cylinder(21); insert and lower burners to one side surface of which a gas pipe is connected along a length direction of a support post(23) fixed to the stand(26), and which are installed with vertically spaced apart from each other; an ignition plug(18) which is movable by an ignition plug transferring cylinder(20) on a support(24) fixed to the support post(23), and which is installed so as to ignite flame to each of the burners as the ignition plug(18) is being slid on the support post(23) by a fixture(15); and a pair of auxiliary plates(22) which are fixed to positions adjacent to each of the burners so as to close a molten steel discharging port of an immersion nozzle(8) during preheating operation, and which has a radius of curvature corresponding to the immersion nozzle(8).

Description

턴디쉬 내화물 노즐 예열장치{DEVICE FOR NOZZLE PRE-HEATING OF TUNDISH REFRACTORY}Tundish Refractory Nozzle Preheater {DEVICE FOR NOZZLE PRE-HEATING OF TUNDISH REFRACTORY}

본 발명은 턴디쉬 내화물 노즐 예열장치에 관한 것으로, 보다 상세하게는 턴디쉬의 침지노즐을 균일하여 예열하여 노즐의 산화를 방지함은 물론 턴디쉬의 상부노즐과 플레이트를 동시에 예열함으로써 용강의 주형 주입시 온도편차에 의한 턴디쉬 플레이트의 크랙을 방지하고 주조시 개재물의 부착을 최소화할 수 있도록 한 턴디쉬 내화물 노즐 예열장치에 관한 것이다.The present invention relates to a tundish refractory nozzle preheating device, and more particularly, to inject the molten steel by preheating the immersion nozzle of the tundish uniformly to prevent oxidation of the nozzle as well as to preheat the upper nozzle and the plate of the tundish simultaneously. The present invention relates to a tundish refractory nozzle preheating device which prevents cracking of the tundish plate due to temperature variation and minimizes adhesion of inclusions during casting.

도 1은 일반적인 연주설비를 나타내는 개략도로서, 래들(1)로부터 공급된 용강(2)은 턴디쉬(3)를 거쳐 주형(4)으로 이송되어 인출됨과 동시에 냉각되어 주편을 형성하게 된다.1 is a schematic view showing a general playing equipment, the molten steel (2) supplied from the ladle (1) is transferred to the mold (4) through the tundish (3) and withdrawn and cooled at the same time to form a cast.

이때, 용강(2)이 주형(4)으로 공급되는 순간 급격한 온도변화로 인해 용강(2)이 산화되는 것을 방지하고 원활한 주입을 위해 래들(1)과 턴디쉬(3) 사이에는 롱노즐(5)이 설치되고, 턴디쉬(3)와 주형(4) 사이에는 침지노즐(8)이 설치된다.At this time, the molten steel 2 is prevented from being oxidized due to a sudden temperature change when the molten steel 2 is supplied to the mold 4, and the long nozzle 5 between the ladle 1 and the tundish 3 for smooth injection. ) Is installed, and the immersion nozzle 8 is installed between the tundish 3 and the mold 4.

그런데, 이러한 노즐들은 예열되지 않은 상태로 사용되게 되면 용강(2)과의 온도편차가 극심하여 특히 턴디쉬플레이트(7)의 경우에는 크랙이 발생되고, 침지노즐(8) 내부에는 주조시 개재물과 지금이 형성되어 주조가 불가하게 되는 문제가 유발된다.However, when these nozzles are used without being preheated, the temperature deviation from the molten steel 2 is extremely high, especially in the case of the tundish plate 7, and cracks are generated in the nozzle nozzle 8. Now a problem arises that the casting is made impossible.

이를 방지하기 위해 침지노즐(8)을 예열하여야 하는 바, 종래에는 도 2의 도시와 같이, 예열버너(9)를 용강토출구(8b)에 삽입시켜 예열하였다.In order to prevent this, the immersion nozzle 8 needs to be preheated. In the related art, as shown in FIG. 2, the preheat burner 9 is inserted into the molten steel discharge port 8b to preheat.

이때, 예열버너(9)의 불꽃이 외부로 유출되지 못하도록 일측 용강토출구(8b)는 세라크울과 같은 소재로 밀폐된다.At this time, one side of the molten steel discharge port (8b) is sealed with a material such as cerak wool so that the flame of the preheat burner (9) does not flow to the outside.

그러나, 이와 같은 방식은 침지노즐(8) 전체에 걸쳐 균일한 예열이 되지 않고 어느 특정한 부위만이 집중 가열되기 때문에 과열된 부위에서는 산화가 유발되며, 또한 턴디쉬(3)의 상부노즐(도 1의 '6')과 턴디쉬플레이트(7)는 예열되지 않아 용강(2) 주입시 크랙이 유발되게 된다.However, this method does not provide uniform preheating throughout the immersion nozzle 8, so that only a specific part is heated intensively, so that oxidation occurs at the overheated part, and also the upper nozzle of the tundish 3 (Fig. 1). '6') and the tundish plate (7) is not preheated will cause cracks in the molten steel (2) injection.

특히, 크랙이 발생되면 침지노즐(8)의 노즐헤드(8a)와 턴디쉬플레이트(7) 사이에 공기가 혼입되어 강한 난류유동이 발생되고, 이는 트랩과 응고셀의 재용융을 유발하여 조업사고의 원인이 되기도 하며, 또한 비금속 개재물의 분리부상을 방해하여 주편의 품질을 악화시키게 된다.In particular, when a crack is generated, air is mixed between the nozzle head 8a of the immersion nozzle 8 and the tundish plate 7 to generate a strong turbulent flow, which causes re-melting of the trap and the solidification cell, thereby causing an accident. In addition, it may cause a deterioration in the quality of the cast steel by preventing the separation of non-metallic inclusions.

본 발명은 상술한 바와 같은 종래 기술이 갖는 제반 문제점을 감안하여 이를 해결하고자 창출한 것으로, 턴디쉬의 침지노즐은 물론 턴디쉬플레이트까지 균일한 예열이 이루어질 수 있도록 하여 침지노즐의 산화를 방지함은 물론 턴디쉬플레이트의 크랙을 미연에 방지하여 조업사고를 막고 고품위의 주편을 생산할 수 있도록 한 턴디쉬 내화물 노즐 예열장치를 제공함에 그 목적이 있다.The present invention was created in view of the above-described problems of the prior art as described above, and to prevent the oxidation of the immersion nozzle by allowing a uniform preheating to the immersion nozzle of the tundish as well as the tundish plate. Of course, the purpose of the present invention is to provide a tungdish refractory nozzle preheating device which prevents cracking of the tundish plate in advance, thereby preventing operation accidents and producing high quality cast steel.

본 발명의 상술한 목적은 베이스에 고정된 가이드와; 상기 가이드를 따라 버너 이송용 실린더에 의해 활주가능하게 설치되는 스탠드와; 상기 스탠드에 고정된 지지포스트의 길이방향을 따라 그 일측면에 가스관과 연결되고, 서로 상하방향으로 이격되어 설치된 인서트 및 하부버너와; 상기 지지포스트에 고정된 서포트상의 점화플러그 이송용 실린더에 의해 이동가능하고, 고정구에 의해 상기 지지포스트에활주되면서 상기 각 버너에 불꽃을 점화시키도록 설치된 점화플러그와; 예열작업시 침지노즐의 용강토출구를 폐쇄할 수 있도록 상기 각 버너의 인접위치에 고정되고, 상기 침지노즐과 대응되는 곡률반경을 갖는 한쌍의 보조판을 포함하여 구성함에 의해 달성된다.The above object of the present invention is a guide fixed to the base; A stand slidably installed by a burner conveying cylinder along the guide; An insert and a lower burner connected to a gas pipe on one side of the support post fixed to the stand and spaced apart from each other in a vertical direction; An ignition plug movable by an ignition plug transfer cylinder on a support fixed to the support post, the ignition plug slid to the support post by a fixture to ignite a flame in each burner; It is achieved by including a pair of auxiliary plates fixed to an adjacent position of each burner so as to close the molten steel discharge port of the immersion nozzle during preheating operation, and having a radius of curvature corresponding to the immersion nozzle.

도 1은 일반적인 연주설비를 개략적으로 도시한 예시도,1 is an exemplary view schematically showing a general playing equipment,

도 2는 종래 기술에 따른 연주설비의 침지노즐 예열과정을 보인 개략적인 작업상태도,Figure 2 is a schematic working state showing the immersion nozzle preheating process of the playing equipment according to the prior art,

도 3은 본 발명에 따른 노즐 예열장치의 구조 및 작동관계를 보인 횡단면도,3 is a cross-sectional view showing the structure and operation of the nozzle preheating apparatus according to the present invention;

도 4는 본 발명에 따른 노즐 예열장치의 작동상태 사시도,Figure 4 is a perspective view of the operating state of the nozzle preheating apparatus according to the present invention,

도 5는 본 발명에 따른 노즐 예열장치의 사용상태를 보인 요부 단면도.Figure 5 is a sectional view of the main portion showing a state of use of the nozzle preheating apparatus according to the present invention.

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

8 : 침지노즐, 8b : 용강토출구,8: immersion nozzle, 8b: molten steel outlet,

16 : 인서트버너, 17 : 하부버너,16: insert burner, 17: lower burner,

16a,17a : 방사구, 18 : 점화플러그,16a, 17a: spinneret, 18: spark plug,

20,21 : 실린더, 22 : 보조판,20,21: cylinder, 22: auxiliary plate,

23 : 지지포스트, 25 : 가이드,23: support post, 25: guide,

26 : 스탠드.26: stand.

이하에서는, 본 발명에 따른 바람직한 일 실시예를 첨부도면에 의거하여 보다 상세하게 설명한다.Hereinafter, a preferred embodiment according to the present invention will be described in more detail on the basis of the accompanying drawings.

도 3은 본 발명에 따른 노즐 예열장치의 구조 및 작동관계를 보인 횡단면도이고, 도 4는 본 발명에 따른 노즐 예열장치의 사용상태 요부 사시도이다.Figure 3 is a cross-sectional view showing the structure and operation of the nozzle preheating apparatus according to the present invention, Figure 4 is a perspective view of the main use state of the nozzle preheating apparatus according to the present invention.

도 3 내지 도 4에 따르면, 설치바닥면에 지지되는 베이스(30)의 상면에 서로 대향되는 면을 따라 '⊂'형상의 가이드(25)가 고정된다.According to Figures 3 to 4, the '25' shaped guide 25 is fixed to the upper surface of the base 30 which is supported on the installation bottom surface to face each other.

상기 가이드(25)에는 사각판상의 스탠드(26)가 삽입되어 가이드(25)를 따라 활주가능하게 설치된다.The stand 25 is inserted into the guide 25 to be slidably installed along the guide 25.

상기 스탠드(26)에는 가이드(25)의 일단에 고정된 버너 이동용 실린더(21)가 연결되어 상기 스탠드(26)를 용이하게 이동시킬 수 있도록 구성된다.A burner moving cylinder 21 fixed to one end of the guide 25 is connected to the stand 26 so that the stand 26 can be easily moved.

스탠드(26)의 상면에는 지지포스트(23)가 입설되고, 지지포스트(23)의 길이방향을 따라 일측면에는 다수의 고정구(15)에 의해 예열용 열원을 만들기 위한 가스 및 산소의 통로인 가스관(12)이 견고히 고정된다.A support post 23 is installed on an upper surface of the stand 26, and a gas pipe that is a passage for gas and oxygen for making a heat source for preheating by a plurality of fasteners 15 on one side along the longitudinal direction of the support post 23. (12) is firmly fixed.

상기 가스관(12)에는 수동으로 개폐조작할 수 있는 수동밸브(19)가 설치된다.The gas pipe 12 is provided with a manual valve 19 that can be opened and closed manually.

상기 각 가스관(12)의 일단부에는 인서트버너(16) 및 하부버너(17)가 구비되는 바, 상기 인서트버너(16)는 하부버너(17) 보다 상측에 위치되도록 한다.One end of each of the gas pipes 12 is provided with an insert burner 16 and a lower burner 17, and the insert burner 16 is positioned above the lower burner 17.

그리고, 상기 인서트버너(16)의 전방측 가스관(12)상과 하부버너(17)의 후단에는 회전가능하게 작동되는 보조판(22)이 구비된다.In addition, an auxiliary plate 22 rotatably operated is provided on the front gas pipe 12 of the insert burner 16 and the rear end of the lower burner 17.

상기 보조판(22)은 침지노즐(8)의 직경만큼 이격되어 설치되며, 침지노즐(8)의 곡률반경과 대응되는 곡률을 갖고 형성됨이 바람직하다.The auxiliary plate 22 is spaced apart by the diameter of the immersion nozzle 8, it is preferable to have a curvature corresponding to the radius of curvature of the immersion nozzle (8).

아울러, 각 버너(16,17)의 인접 상측에는 점화용 점화플러그(20)가 구비되며, 상기 점화플러그(20)는 점화플러그 이송용 실린더(20)에 이동가능하게 고정되는 바, 점화플러그 이송용 실린더(20)는 지지포스트(23)에 견실히 고정된 서포트(24)의 일측에 고정 설치된다.In addition, an ignition spark plug 20 is provided at an upper side of each burner 16 and 17 and the spark plug 20 is fixed to the spark plug transport cylinder 20 so as to be movable. Dragon cylinder 20 is fixedly installed on one side of the support 24 fixed to the support post (23).

이러한 구성으로 이루어진 본 발명은 다음과 같이 작동된다.The present invention made up of such a configuration works as follows.

침지노즐(8)을 예열하기 위해, 먼저 버너 이동용 실린더(21)를 작동시켜 스탠드(26)를 침지노즐(8)의 용강토출구(8b)측으로 이동시킨다.In order to preheat the immersion nozzle 8, first, the burner moving cylinder 21 is operated to move the stand 26 to the molten steel discharge port 8b side of the immersion nozzle 8.

용강토출구(8b)에 각 버너(16,17)가 근접하게 되면 점화플러그 이송용 실린더(20)를 작동시켜 점화플러그(18)를 통해 각 버너(16,17)를 점화시키도록 한다.When the burners 16 and 17 are close to the molten steel discharge port 8b, the spark plug transfer cylinder 20 is operated to ignite each burner 16 and 17 through the spark plug 18.

이어, 점화된 버너(16,17)중 인서트버너(16)는 용강토출구(8b)로 삽입되고 하부버너(17)는 상기 용강토출구(8b)의 하단 외측, 즉 침지노즐(8)의 하단면에 위치되게 된다.Then, the insert burner 16 of the ignited burners 16 and 17 is inserted into the molten steel discharge port 8b and the lower burner 17 is the lower outer side of the molten steel discharge port 8b, that is, the lower surface of the immersion nozzle 8. Will be located at.

이 상태는 인서트버너(16)측에 구비된 보조판(22)이 용강토출구(8b)의 일면을 폐쇄하고 있는 형상이며, 이어 하부버너(17)측에 연결된 보조판(22)을 회전시켜나머지 용강토출구(8b)도 폐쇄토록 한다.This state is a shape in which the auxiliary plate 22 provided on the insert burner 16 side closes one surface of the molten steel discharge port 8b. Then, the auxiliary plate 22 connected to the lower burner 17 side is rotated so that the remaining molten steel discharge port (8b) is also to be closed.

이와 같은 예열장치를 통해 예열하게 되면 용강토출구(8b)를 통해 버려지는 열이 없어 불꽃이 노즐헤드(8a)까지 상승하게 되므로 침지노즐(8) 전체에 걸쳐 균일한 예열이 가능하고, 또한 침지노즐(8) 하단에서는 별도의 하부버너(17)에 의해 예열시킴으로써 열보상이 가능함은 물론 침지노즐(8)의 외주연과 연결된 턴디쉬플레이트(7)까지 예열시킬 수 있게 된다.When preheated through such a preheating device, since no heat is discarded through the molten steel discharge port 8b, the flame rises up to the nozzle head 8a, so that uniform preheating is possible throughout the immersion nozzle 8, and also the immersion nozzle. (8) At the lower end, heat compensation is possible by preheating by a separate lower burner (17), as well as the preheated tundish plate (7) connected to the outer circumference of the immersion nozzle (8).

이때, 도 5의 도시와 같이 인서트버너(16)측의 방사구(16a)는 수직하게 형성하고, 하부버너(17)측의 방사구(17a)는 버너(17) 외주연측을 향해 경사지게 형성함으로서 인서트버너(16)를 통해 방출된 불꽃은 직상방으로 길게 방사되도록 하고 하부버너(17)을 통해 방출된 불꽃은 버너(17)의 직경방향으로 퍼지면서 방사되도록 함이 특히 바람직하다.At this time, as shown in FIG. 5, the spinneret 16a on the insert burner 16 side is vertically formed, and the spinneret 17a on the lower burner 17 side is inclined toward the outer peripheral side of the burner 17. It is particularly preferable to allow the flame emitted through the insert burner 16 to be radiated in a straight upward direction and the flame emitted through the lower burner 17 to radiate while spreading in the radial direction of the burner 17.

이상에서 상세히 설명한 바와 같이, 본 발명은 턴디쉬의 침지노즐을 노즐 전체에 걸쳐 균일하게 예열시킬 수 있음으로서 부분적인 산화를 막고, 아울러 턴디쉬플레이트도 동시 예열되므로 플레이트의 크랙을 예방하여 주조중 공기혼입을 차단할 수 있어 연주작업의 안정성 확보는 물론 고품위의 주편을 생산할 수 있는 효과를 제공한다.As described in detail above, the present invention can preheat the immersion nozzle of the tundish uniformly throughout the nozzle to prevent partial oxidation and at the same time the tundish plate is also preheated to prevent cracking of the plate to prevent air during casting. It can block the mixing and secure the stability of the performance, and also provide the effect of producing high quality cast.

Claims (2)

베이스(30)에 고정된 가이드(25)와;A guide 25 fixed to the base 30; 상기 가이드(25)를 따라 버너 이송용 실린더(21)에 의해 활주가능하게 설치되는 스탠드(26)와;A stand 26 slidably installed by the burner transfer cylinder 21 along the guide 25; 상기 스탠드(26)에 고정된 지지포스트(23)의 길이방향을 따라 그 일측면에 가스관(12)과 연결되고, 서로 상하방향으로 이격되어 설치된 인서트 및 하부버너(16,17)와;Inserts and lower burners (16, 17) connected to the gas pipe (12) on one side of the support post (23) fixed to the stand (26) and spaced apart from each other in the vertical direction; 상기 지지포스트(23)에 고정된 서포트(24)상의 점화플러그 이송용 실린더(20)에 의해 이동가능하고, 고정구(15)에 의해 상기 지지포스트(23)에 활주되면서 상기 각 버너(16,17)에 불꽃을 점화시키도록 설치된 점화플러그(18)와;The burners 16 and 17 are movable by the spark plug conveying cylinder 20 on the support 24 fixed to the support post 23 and slide to the support post 23 by the fastener 15. Spark plug 18 installed to ignite the flame; 예열작업시 침지노즐(8)의 용강토출구(8b)를 폐쇄할 수 있도록 상기 각 버너(16,17)의 인접위치에 고정되고, 상기 침지노즐(8)과 대응되는 곡률반경을 갖는 한쌍의 보조판(22)을 포함하여 구성되는 것을 특징으로 하는 턴디쉬 내화물 노즐 예열장치.A pair of auxiliary plates fixed to adjacent positions of the burners 16 and 17 so as to close the molten steel discharge port 8b of the immersion nozzle 8 during preheating operation and having a radius of curvature corresponding to the immersion nozzle 8. A tundish refractory nozzle preheater, characterized in that it comprises a (22). 제1항에 있어서, 상기 인서트버너(16)의 방사구(16a)는 수직하게 형성되고, 하부버너(17)의 방사구(17a)는 상기 하부버너(17)의 외주연측을 향해 경사지게 형성된 것을 특징으로 하는 턴디쉬 내화물 노즐 예열장치.According to claim 1, wherein the spinneret (16a) of the insert burner 16 is formed vertically, the spinneret (17a) of the lower burner 17 is formed to be inclined toward the outer peripheral side of the lower burner (17) Tundish refractory nozzle preheating device, characterized in that.
KR10-2000-0061305A 2000-10-18 2000-10-18 Device for nozzle pre-heating of tundish refractory KR100491120B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100530326B1 (en) * 2001-05-14 2005-11-22 주식회사 포스코 Shroud nozzle top burner preheater
KR100930111B1 (en) * 2002-11-27 2009-12-07 주식회사 포스코 Preheater suitable for immersion nozzle for thin slab with narrow discharge port
KR20160126365A (en) * 2015-04-23 2016-11-02 현대제철 주식회사 Tundish device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101660771B1 (en) * 2014-08-28 2016-09-28 주식회사 포스코 Apparatus for preheating a nozzle and Method for preheating a nozzle

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59178157A (en) * 1983-03-25 1984-10-09 Nippon Steel Corp Method and device for heating nozzle for injecting molten metal
JPS61103653A (en) * 1984-10-26 1986-05-22 Nippon Steel Corp Slag removal of tundish
JPS61262455A (en) * 1985-05-11 1986-11-20 Kobe Steel Ltd Heating method for tundish nozzle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100530326B1 (en) * 2001-05-14 2005-11-22 주식회사 포스코 Shroud nozzle top burner preheater
KR100930111B1 (en) * 2002-11-27 2009-12-07 주식회사 포스코 Preheater suitable for immersion nozzle for thin slab with narrow discharge port
KR20160126365A (en) * 2015-04-23 2016-11-02 현대제철 주식회사 Tundish device

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