KR940007145Y1 - Automatic control device of molton iron level - Google Patents

Automatic control device of molton iron level Download PDF

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Publication number
KR940007145Y1
KR940007145Y1 KR92021586U KR920021586U KR940007145Y1 KR 940007145 Y1 KR940007145 Y1 KR 940007145Y1 KR 92021586 U KR92021586 U KR 92021586U KR 920021586 U KR920021586 U KR 920021586U KR 940007145 Y1 KR940007145 Y1 KR 940007145Y1
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South Korea
Prior art keywords
molten iron
slag
level
control device
automatic control
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KR92021586U
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Korean (ko)
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KR940012634U (en
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정진경
한정환
이상호
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박득표
포항종합제철 주식회사
백덕현
재단법인 산업과학기술연구소
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Priority to KR92021586U priority Critical patent/KR940007145Y1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/14—Discharging devices, e.g. for slag
    • 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
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0028—Devices for monitoring the level of the melt
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material
    • F27D3/145—Runners therefor
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1545—Equipment for removing or retaining slag
    • F27D3/159—Equipment for removing or retaining slag for retaining slag during the pouring of the metal or retaining metal during the pouring of the slag
    • 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
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

내용 없음.No content.

Description

고로의 대탕도내 용선레벨 자동조절장치Automatic Charter Level Control System in Blast Furnace

제1도는 본 고안에 따른 용선레벨 자동조절장치의 개략구성도.1 is a schematic configuration diagram of a molten iron level automatic control device according to the present invention.

제2도는 본 고안에 따른 용선레벨 자동조절장치의 측단면도.Figure 2 is a side cross-sectional view of the molten iron level automatic control device according to the present invention.

제3도는 종래 기술에 따른 고로의 대탕도 구성을 도시한 설명도이다.3 is an explanatory diagram showing the configuration of a large hot water blast furnace according to the prior art.

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

1 : 용선레벨 자동조절장치 10 : 강판1: molten iron level automatic control device 10: steel sheet

20 : 텅스텐판 30 : 슬래그용 유입재20: tungsten plate 30: inflow material for slag

40 : 용선용유입제 100 : 대탕도40: molten metal inlet agent 100: large bath

110 : 고로 125 : 슬래그(slag)110: blast furnace 125: slag

130 : 용산 135 : 슬래그배재구130: Yongsan 135: slag discharge zone

140a : 용선배출구140a: Charter outlet

본 고안은 고로(高爐)의 제선(製銑) 공정에서 용선과 슬래그를 분리, 수송하는 통로인 대탕도에 관한 것으로, 사용기간을 연장하고, 슬래그(slag)중의 용선혼입방지 및 용선중의 슬래그유입을 방지하도록된 고로의 대탕도내 용선레벨 자동조절장치에 관한 것이다.The present invention relates to a large hot waterway, a passage for separating and transporting molten iron and slag in a blast furnace making process, which prolongs the service life, prevents mixing of molten iron in slag, and slag in molten iron. The present invention relates to a molten iron level automatic control device in a large waterway of a blast furnace to prevent inflow.

종래의 대탕도(100)는 제3도에 도시된 바와같이, 고로(110)로부터 2-3시간 간격으로 유출되는 1500℃ 정도의 용융물(120)이 상기 대탕도(100)를 통해 수송되면서 슬래그(125) 및 용선(130)으로 분리되고, 슬래그(125)는 대탕도(100)의 상부측에 형성된 배재구(135)를 통해 외부로 배출되고, 용선은 스키머(skimmer)(140)를 통해 외부로 배출된다.As shown in FIG. 3, the conventional large bath 100 is slag while the melt 120 having about 1500 ° C. flowing out of the blast furnace 110 at intervals of 2-3 hours is transported through the large bath 100. Separated into the 125 and the molten iron 130, the slag 125 is discharged to the outside through the discharge hole 135 formed on the upper side of the large bath 100, the molten iron is through the skimmer (140) It is discharged to the outside.

시간이 지남에 따라서 대탕도(100)의 사용횟수가 늘어나게 되고, 배개구(135)의 높이나 스커머(140) 아래의배출구(140a) 마모등이 발생하여 설계기준인 초기시공상태를 유지하지 못하게 되며, 만일, 배재구(135)의 높이가 낮아진 상태에서는 용선(130)이 슬래그(125)와 함께 배재구(135)로 배출되어 슬래그(125)의 냉각처리시 거대한 괴(塊)를 형성하고, 또한 용선 생산량이 적은 경우에는 슬래그(125)가 스커버(140)하부의 배출구(140a)로 유입되어 용선(130) 중에 함유됨으로서 수선(受銑)효율을 저하시키는 것이다. 한편, 상기 대탕도(100)는 슬래그(125)와 용선(130)을 동시에 운반시키는 용기이기 때문에, 상단부로부터 400㎜까지의 영역(a)은 슬래그용 유입재인 AU3(Al2O3: 58%, SiO2: 4%, SiC : 33%)로 구성되고, 400㎜이하의 영역(b)은메탈(metal)용 유입재 AU1(Al2O3: 74%, SiO2: 4%, Sic : 16%)로 각각 제작된다. 그러나, 용선(125) 및 슬래그(130)가 대탕도(100)내를 주기적으로 통과하므로 마모에 따른 배재구(135)와 배출구(140a)의 크기 변화 및, 슬래그(125)와 용선(130)량의 변화에 의하여 용선(130)과 슬래그(125)의 경계지점(p)위치가 수시로 변화하며,이로인해 대탕도(100)의 국부침식 및 마모가 심화된다. 일본국 특허공개공보 소 61-124511호에서는 고로 출선동의 측벽손상억제를 위해 용선대탕도의 사용을 중지하고 대탕도내 잔류용선을 제거한 후, 배재구(135)나 스키머(140) 및 그 후면에 위치한 언덕부(140b)의 크기를 덧붙이거나 제거하여 용선레벨을 항상 일정하게 유지하도록 조정하였으며, 이로인해 대탕도 사용시간을 5-10일간 연장하였다. 그러나 여기에서는 출선동사용을 중지하고 인위적으로 배재구나 언덕부의 높이변경을 하여야 하는 문제점이 있다. 유사한 원리에 의해 제작된 제강전로출강중 용강내로의 슬래그 유입방지용 슬래그 체크볼은 형태에 있어서 용강배출구의 크기를 조절하지 못하므로 용강의 레벨을 조정할 수가 없고 출강량을 조절할 수가 없으며 출강이 종료됨과 동시에 용강배출구를 폐쇄하는 용강만을 가지고 있는 단점이 있다.As time goes by, the number of times of use of the large bath 100 increases, and the height of the vent opening 135 or wear of the outlet 140a under the skimming 140 occurs, so that the initial construction state, which is the design standard, cannot be maintained. If, when the height of the exhaust outlet 135 is lowered, the molten iron 130 is discharged to the exhaust outlet 135 together with the slag 125 to form a huge ingot during the cooling process of the slag 125 and In addition, when the molten iron production is small, the slag 125 is introduced into the outlet 140a of the lower portion of the cover 140 to be contained in the molten iron 130, thereby lowering the repairing efficiency. On the other hand, since the large hot water 100 is a container for transporting the slag 125 and the molten iron 130 at the same time, the area (a) from the upper end to 400 mm is AU3 (Al 2 O 3 : 58%) which is an inflow material for slag. , SiO 2 : 4%, SiC: 33%), and the area (b) of 400 mm or less consists of metal inflow material AU1 (Al 2 O 3 : 74%, SiO 2 : 4%, Sic: 16% each). However, since the molten iron 125 and the slag 130 periodically pass through the large bath 100, the size change of the exhaust outlet 135 and the outlet 140a and the slag 125 and the molten iron 130 according to the wear. The position of the boundary point (p) of the molten iron 130 and the slag 125 changes from time to time by the change of the amount, thereby deepening the local erosion and wear of the large bath 100. In Japanese Patent Laid-Open No. 61-124511, in order to suppress sidewall damage of the blast-furnace, the use of the chartered seawater is stopped and the residual molten iron in the seawater is removed. By adding or removing the size of the hill (140b) was adjusted to keep the molten iron level is always constant, thereby extending the use time of the large bath also 5-10 days. However, there is a problem in that stopping the use of the maneuvering movement and artificially changing the height of the excavation or hill. The slag check ball for preventing slag inflow into the molten steel during steelmaking outgoing steel produced by the similar principle cannot adjust the size of the molten steel outlet, so the level of molten steel cannot be adjusted, the amount of tapping cannot be adjusted, and the tapping is finished. At the same time, there is a drawback of having only molten steel to close the molten steel outlet.

본 고안은 상기와 같은 종래기술의 문제점을 해소하기 위하여 안출된 것으로서 대탕도내에서 용선량에 관계없이, 또한 슬래그배재구나 용선배출구의 크기에 관계없이 항상 일정한 용선레벨을 유지할 수 있도록 하여대탕도의 수명을 연장시키고, 또한, 슬래그중 용선의 혼입을 방지하고자한 고로의 대탕도내 용선레벨 자동조절장치를 제공함에 그 목적이 있다. 상기 목적을 달성하기 위하여 본 고안은 슬래그와 용선의 비중차이를 이용하여 출강되는 용선과 슬래그의 량(量)에 따라 스키머의 용선배출구 크기를 조절함으로써 대탕도내의 용선레벨을 적절한 목표치 수준으로 유지시킬수 있는 용선레벨 자동조절장치를 마련함에 의한다.The present invention was devised to solve the problems of the prior art as described above, so that it is possible to maintain a constant molten iron level at all times regardless of the molten iron amount in the molten metal and regardless of the size of the slag discharger or the molten iron outlet. It is also an object of the present invention to provide an apparatus for automatically adjusting the molten iron level in the molten metal of the blast furnace to prevent the mixing of the molten iron in the slag. In order to achieve the above object, the present invention can maintain the molten iron level in the main bath by adjusting the size of the molten iron and the slag discharged out according to the amount of molten iron and slag, using the specific gravity difference between slag and molten iron. By providing a charter level automatic control device.

이하, 본 고안을 도면에 따라 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to the drawings.

본 고안에 따른 용선레벨 자동조절장치(1)는 대탕도(100)의 배출구(140a)에 장착된다. 상기 용선레벨 자동조절장치(1)는 내부에 장방형의 강판(10) 및 텅스텐판(20)이 위치되고, 그 외부에 내화물인 슬래그용 유입재(30)와 용선용 유입재(40)를 접착하여 이루어진다. 상부측(c)의 비중을 5.5정도로 유지시키기 위해 비중이 7.8인 강판(l0)과 비중이 2.72인 슬래그유입재(30) 체적비를 각각 5.5 : 4.5로 구성하였으며, 하부측(d)의 비중을 용선(130)의 비중과 같은 7.8로 유지하기 위해 비중이 19.3인 텅스텐판(20)과, 비중이 2.75인 용선용 유입재(40)의 체적비를 각각 3 : 7로 구성한다.The molten iron level automatic control device 1 according to the present invention is mounted at the outlet 140a of the large bath 100. The molten iron level automatic control device 1 has a rectangular steel plate 10 and tungsten plate 20 is located therein, and adheres the slag inflow material 30 and the molten iron inflow material 40 to the outside thereof. It is done by In order to maintain the specific gravity of the upper side (c) to about 5.5, the volume ratio of the slag inlet material 30 having a specific gravity of 7.8 and the specific gravity of 2.72 was 5.5: 4.5, respectively. In order to maintain the same ratio as the specific gravity of the molten iron 130, the volume ratio of the tungsten plate 20 having a specific gravity of 19.3 and the molten iron inflow material 40 having a specific gravity of 2.75 is 3: 7, respectively.

따라서, 용선레벨 자동조절장치(1)가 대탕도(100)대에 잠기는 경우, 대탕도(100)내의 용선(130)의 상단레벨, 즉 경계지점(p)이 용선레벨 자동조절장치(1)의 슬래그유입재(30)와 용선용 유입제(40)의 경계면(Pa)에 위치하게 되어 용선용 유입재(40)는 용선(130)내에 위치되며, 슬래그유입재(30)는 슬래그(125)내에 위치된다.Therefore, when the molten iron level automatic control device 1 is submerged in the large bathway 100, the upper level of the molten iron 130 in the large bath 100, that is, the boundary point p, is the molten iron level automatic control device 1. Slag inflow material 30 and the molten iron inflow agent 40 is located at the interface (Pa), the molten iron inflow material 40 is located in the molten iron 130, the slag inflow material 30 is slag 125 )

한편, 용선(130)이 배출되는 스키머(140) 아래의 배출구(140a)크기는 종래의 것보다 크게하고. 상기와 같은 용선레벨 자동조절장치(1)가 배출구(140a)에 접하여 위치된다.(제2도 참조)On the other hand, the size of the outlet 140a below the skimmer 140 from which the molten iron 130 is discharged is larger than the conventional one. The above-described molten iron level automatic control device 1 is located in contact with the outlet 140a. (See FIG. 2)

상기와 같이 위치하는 경우, 고로(110)에서 생산되는 용선(130)의 량(暈)이 많아서 대탕도(100)내 용선(130)레벨이 높아지게 되면 용선레벨 자동조절장치(1)는 함께 상승되고(제2도의 점선참조). 이와함께 배출구(140a)의 넓이가 확대되어 용서배출량이 증대되며, 곧바로 대탕도(1O0)내의 용선(130)레벨이 일정목표수준으로 감소된다.If the position as described above, the amount of the molten iron 130 produced in the blast furnace 110 is large (暈), when the molten iron 130 level in the large waterway 100 is increased, the molten iron level automatic control device 1 rises together (See dotted line in FIG. 2). Along with this, the width of the outlet 140a is expanded to increase the forgiveness amount, and the molten iron 130 level in the large bath 100 is reduced to a predetermined target level.

그러나, 상기와는 반대로 고로(110)에서 생산되는 용선량이 적어 용선레벨이 떨어지면 용선레벨 자동조절장치(1)도 함게 낮아지게 되고(제2도의 실선참조), 이와함께 용선배출구(140a)의 넓이바 축소되어 용선배출량이 적어지게 되며 곧바로 용선레벨이 일정목표수준으로 유지된다. 이러한 원리는 용선(130)량이 매우 많아져도 배출구(140a)의 넓이가 확대되어 배출되기 때문에 슬래그배재구(135)를 통해 누출되지 않으며, 용선(130)량이 매우 적어도 슬래그(140a)를 통해 유출되지 않게된다.However, in contrast to the above, when the amount of molten iron produced in the blast furnace 110 is small, the molten iron level falls, and the molten iron level automatic control device 1 is also lowered (refer to the solid line in FIG. 2), together with the width of the molten iron outlet 140a. As the bar is reduced, the amount of charter emissions is reduced, and the charter level is immediately maintained at the target level. This principle does not leak through the slag outlet 135 because the width of the discharge port 140a is enlarged and discharged even if the amount of molten iron 130 is very large, and the amount of molten iron 130 does not flow out at least through the slag 140a. Will not.

상기에서와 같이 본 고안에 의하면 대탕도(100)내에 설치되어 용선(130)의 레벨을 자동으로 조절하기 때문에 어떠한 경우에도 일정한 용선(130)레벨을 유지하여 대탕도(100)의 수명을 연장시킬 수 있으며, 또한, 용선(130)이 배재구(135)로 누출되는 것을 방지하여 실수율을 향상시킬 수 있고, 슬래그(125)가 배출구(140a)를 통해 용선(130)과 함께 유출되지 않기 때문에 수선(受銑)효율을 증대시킬 수 있는 실용상의 효과를 얻게된다.According to the present invention as described above is installed in the large bath 100 to automatically adjust the level of the molten iron 130 in any case to maintain a constant level of molten iron 130 to extend the life of the large bath 100 In addition, the molten iron 130 may be prevented from leaking to the outlet 135 to improve the error rate, and since the slag 125 does not flow out along with the molten iron 130 through the outlet 140a, the repair may be performed. (Iii) The practical effect to increase the efficiency is obtained.

Claims (1)

고로(110)의 제선(製銑) 공정에서 용선(130)과 슬래그(125)를 분리, 수송시키는 대탕도(100)에 있어서, 스커머(140)의 배출구(140a)에 인접하여 위치되고, 내부에 상부에는 장방형의 강판(10)이 가로로 위치되고 하부에는 장방형의 텅스텐판(20)이 세로로 위치되며, 상기 강판(10)의 외측에는 내화물인 슬래그용 유입재(30)를 부착하고 상기 텅스텐판(20)의 외측에는 용선용 유입재(40)를 부착하며, 고로(110)로부터 배출되는 용선(130)과 슬래그(125)의 량(量)에 비례하는 비중차이로 상하강하여 상기 배출구(140a)의 넓이를 조절함으로써 용선(130) 레벨을 목표치 수준으로 유지시킴을 특징으로 하는 고로의 대탕도내 용선레벨 자동조절장치.In the large hot water route 100 for separating and transporting the molten iron 130 and the slag 125 in the blast furnace 110 process, it is located adjacent to the outlet 140a of the skimmer 140, A rectangular steel plate 10 is positioned horizontally in the upper part and a rectangular tungsten plate 20 is positioned vertically in the lower part. The inflow material 30 for slag, which is a refractory material, is attached to the outside of the steel plate 10. The molten iron inlet 40 is attached to the outer side of the tungsten plate 20, and is vertically lowered by a specific gravity difference proportional to the amount of the molten iron 130 and the slag 125 discharged from the blast furnace 110. The molten iron level automatic control device in the blast furnace of the blast furnace, characterized in that to maintain the molten iron 130 level at the target level by adjusting the width of the outlet (140a).
KR92021586U 1992-11-04 1992-11-04 Automatic control device of molton iron level KR940007145Y1 (en)

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