KR20040094228A - Tuyere nozzle for protecting from heating damage by blast furnace - Google Patents

Tuyere nozzle for protecting from heating damage by blast furnace Download PDF

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Publication number
KR20040094228A
KR20040094228A KR1020030028297A KR20030028297A KR20040094228A KR 20040094228 A KR20040094228 A KR 20040094228A KR 1020030028297 A KR1020030028297 A KR 1020030028297A KR 20030028297 A KR20030028297 A KR 20030028297A KR 20040094228 A KR20040094228 A KR 20040094228A
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South Korea
Prior art keywords
tuyere
blast furnace
cold air
cooling water
blast
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KR1020030028297A
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Korean (ko)
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KR100962168B1 (en
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김봉호
민병대
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주식회사 포스코
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Priority to KR1020030028297A priority Critical patent/KR100962168B1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor
    • 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
    • F27B1/16—Arrangements of tuyeres
    • 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
    • F27B1/24—Cooling arrangements

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)

Abstract

PURPOSE: To provide a tuyere for protecting from heating damage by blast furnace to prevent the tuyere from being damaged by fusion of molten materials during blast furnace operation. CONSTITUTION: In a tuyere for protecting from heating damage by blast furnace, wherein the tuyere comprises cooling water inflow port and cooling water channel (151) formed to protect the tuyere from heating damage during blast furnace operation, the tuyere comprises a cold blast inflow port (110) formed on the rear side of the tuyere (100); a plurality of cold blast discharge ports (120) formed along the outer circumferential surface of the side of tuyere front part (101); and a plurality of branched channels (130) branched off from the cold blast inflow port and connected to the plurality of cold blast discharge ports, wherein the branched channels have the same inner diameter as the cold blast discharge ports to uniformly transfer cold blast to the cold blast discharge ports.

Description

열손방지용 고로 풍구{Tuyere nozzle for protecting from heating damage by blast furnace}Tuyere nozzle for protecting from heating damage by blast furnace}

본 발명은 고로조업시 고로의 고온으로부터 풍구를 보호하기 위한 열손방지용 고로 풍구에 관한 것이다.The present invention relates to a blast furnace tuft for preventing heat loss for protecting the tuyere from high temperatures of the blast furnace during operation.

일반적인 고로의 조업은 도 1에 도시된 바와 같이, 장입물 저장조(1)에 있는 철광석과 코크스를 장입컨베어(2)를 통해 고로(3)의 상부로 장입한 후 고로의 하부에 설치된 열풍취입장치(10)를 통해 고로내에 미분탄을 열풍과 함께 불어 넣음으로써 노내에서 환원 용융반응을 일으켜 용선을 생산하는 일련의 과정을 말한다. 즉, 취입된 미분탄과 코스가 연소되면서 발생된 고온의 열과 환원가스에 의해 철광석이 환원 용융되면서 쇳물과 슬래그를 생성하며, 이들은 출선구(3a)를 통해 고로밖으로 배출된다.The operation of the blast furnace in general, as shown in Figure 1, after charging the iron ore and coke in the charge storage tank (1) to the upper part of the blast furnace 3 through the charging conveyor (2) installed in the bottom of the blast furnace (10) refers to a series of processes to produce molten iron by reducing melt reaction in the furnace by blowing pulverized coal into the blast furnace with hot air. That is, iron ore is reduced and melted by the high-temperature heat and reducing gas generated by the combustion of the pulverized coal and the coarse coal, and the molten iron and slag are generated, and they are discharged out of the blast furnace through the outlet 3a.

고로(3)내에 열풍을 불어넣기 위한 열풍취입장치(10)는 고로(3)의 하부로 열풍을 불어넣을 수 있는 환상관(11)과, 환산관(11)으로부터 공급되는 열풍의 유로가 되는 블로우파이프(12)와, 블로우파이프 (12)단부에 부착되어 고로(3) 내부로 열풍을 취입시키는 풍구(13)와, 미분탄을 노내로 취입시키는 랜스(14)로 구성된다.The hot air blowing device 10 for blowing hot air into the blast furnace 3 is an annular tube 11 capable of blowing hot air into the lower part of the blast furnace 3 and a flow path of hot air supplied from the conversion pipe 11. A blowpipe 12, a blowhole 13 attached to the blowpipe 12 end and blows hot air into the blast furnace 3, and a lance 14 for blowing pulverized coal into the furnace.

도 2a 및 도 2b에 도시된 바와 같이, 종래의 풍구(13)는 고로(3) 내부에 밀착되야 하는 조업특성상 고로(3)의 고열로부터 보호되도록 제작된다. 이를 위하여, 풍구(13)는 후면에 냉각수가 유입되는 냉각수 유입구(13a)와 유입된 냉각수가 풍구(13)의 내부를 골고루 순환하도록 냉각수로(13b)가 형성된다. 또한, 풍구(13)는 순환하는 냉각수에 의해 신속하게 냉각되도록 열전도가 높은 순동으로 제작된다.As shown in FIGS. 2A and 2B, the conventional tuyere 13 is manufactured to be protected from the high heat of the blast furnace 3 due to the operation characteristic that should be in close contact with the blast furnace 3. To this end, the tuyere 13 is formed with a cooling water inlet 13a through which the coolant flows into the rear surface and a cooling water passage 13b to evenly circulate the inside of the tuyere 13. In addition, the tuyere 13 is made of pure copper having high thermal conductivity so as to be rapidly cooled by the circulating cooling water.

그리고, 도 3에 도시된 바와 같이, 2000℃ 이상의 온도에 노출되는 풍구(13)의 선단부는 예컨대 철 및 크롬과 같은 내화물질로써 하드페이싱(hard facing;H) 처리된다.As shown in FIG. 3, the tip end of the tuyere 13 exposed to a temperature of 2000 ° C. or more is hard faced (H) with refractory materials such as iron and chromium.

그러나, 조업과정에서 풍구(13)의 선단부에는 고로(3)의 용융물 파편들이 융착되며, 이 용융물 파편들은 조업기간이 장기화될수록 양이 증대된다. 특히, 고로(3)의 생산성 향상을 위하여 고로(3) 내부 깊숙히 열풍을 불어넣도록 풍구(13)를 고로의 내측으로 더욱 밀착시킬 경우, 더 많은 용융물이 풍구(13)의 선단부에 융착된다. 이러한 상태가 장기간 지속되면, 풍구(13)의 선단부는 장기간 누적되는 용융물 파편들로 인해 하드페이싱 처리면(H)이 손상되면서 결국 풍구(13)가 열손된다. 만일, 풍구(13)가 고온을 견디지 못하고 파손될 경우 풍구(13)내측을 흐르는 냉각수가 고로(3)의 내부로 유입되어 고로(3)가 폭발하는 대형사고를 유발시킨다.However, melt fragments of the blast furnace 3 are fused at the tip of the tuyere 13 during the operation, and the amount of these fragments increases as the operation period becomes longer. In particular, when the tuyere 13 is brought into close contact with the inside of the blast furnace so as to blow hot air deep inside the blast furnace 3 in order to improve the productivity of the blast furnace 3, more melt is fused to the tip of the tuyere 13. If this condition persists for a long time, the tip portion of the tuyere 13 is damaged due to the melt fragments accumulated for a long time, the hard facing surface (H) is damaged and eventually the tuyere 13 is damaged. If the tuyere 13 does not withstand high temperatures and is damaged, the coolant flowing inside the tuyere 13 is introduced into the blast furnace 3 to cause a large accident in which the blast furnace 3 explodes.

본 발명은, 상기와 같은 문제점들을 해소하기 위해 이루어진 것으로서, 고로조업시 용융물의 융착에 의한 풍구의 손상이 방지되는 열손방지용 고로 풍구의 제공을 목적으로 한다.The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a blast furnace blast hole for preventing damage to the blast hole due to fusion of the melt during blast furnace operation.

도 1은 일반적인 고로조업 과정을 나타내는 흐름도.1 is a flow chart showing a general blast furnace operation process.

도 2a는 종래의 풍구 단면도Figure 2a is a cross-sectional view of the conventional tuyere

도 2b는 종래의 풍구 후면을 나타내는 도면.Figure 2b is a view showing a conventional tuyere rear view.

도 3는 종래의 풍구 선단부에 하드페이싱 처리된 상태를 나타내는 외관도.3 is an external view showing a state in which the conventional hard-faced portion is hard-faced.

도 4는 본 발명에 따른 풍구의 사시도.Figure 4 is a perspective view of the tuyere in accordance with the present invention.

도 5a는 본 발명에 따른 풍구의 단면도.Figure 5a is a cross-sectional view of the tuyere in accordance with the present invention.

도 5b는 본 발명에 따른 풍구 후면을 나타내는 도면.Figure 5b is a view showing the back of the tuyere in accordance with the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

100...풍구 101...풍구선단부100 ... Ball 101 ... Ball end

110...냉풍유입구 120...냉풍토출구110 cold air inlet 120 cold air outlet

130...분기유로 150...냉각수 유입구130 ... 150 euros for branch cooling water inlet

151...냉각수로151.Cooling water

상기 목적을 달성하기 위하여, 본 발명은 고로조업시 풍구의 열손을 방지하기 위하여 형성되는 냉각수 유입구 및 냉각수로를 가지는 열손방지용 풍구에 있어서,In order to achieve the above object, the present invention is a heat loss prevention tuyere having a cooling water inlet and a cooling water passage formed to prevent heat loss of the tuyere during blast furnace operation,

풍구의 후면에 형성된 냉풍유입구;Cold air inlet formed on the rear of the tuyere;

풍구선단부측의 외주면을 따라 형성된 다수의 냉풍토출구; 및A plurality of cold air discharge outlets formed along the outer circumferential surface of the tuyere tip side; And

냉풍유입구로부터 분기되어 다수의 냉풍토출구들과 연결된 다수의 분기유로를 포함한다.It includes a plurality of branch passages branched from the cold air inlet and connected to the plurality of cold air outlets.

또한, 상기 분기유로는 냉풍토출구로 냉풍을 균일하게 전달되도록 동일한 내경을 가지도록 형성되는 것이 바람직하다.In addition, the branch flow path is preferably formed to have the same inner diameter to uniformly transmit the cold air to the cold air outlet.

본 발명의 특징 및 이점들은 첨부도면에 의거한 다음의 상세한 설명으로 더욱 명백해질 것이다. 이에 앞서, 본 명세서 및 청구범위에 사용된 용어나 단어는 발명자가 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다.The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

도 4에서 도시된 바와 같이, 본 발명에 따른 열손방지용 고로 풍구(100)는 냉풍유입구(110)가 후면에 형성되고, 냉풍토출구(120)가 고로의 외주면에 다수 형성된다. 상기 냉풍유입구(110)는 다수의 분기유로(130)에 의해 냉풍토출구(120)들과 연결된다.As shown in Figure 4, the blast furnace blast opening 100 for preventing heat loss according to the present invention, the cold air inlet 110 is formed on the back, the cold air outlet 120 is formed on the outer circumferential surface of the blast furnace. The cold air inlet 110 is connected to the cold air outlets 120 by a plurality of branch passages 130.

상기 풍구(100)의 후면에는 냉풍유입구(110)가 형성된다. 이냉풍유입구(110)는 풍구선단부(101)의 냉각성능을 향상시키도록 복수로 형성되는 것이 바람직하며 본 실시예에서는 풍구 후면에 한 쌍의 냉풍유입구(110)를 형성시켰다.The cold air inlet 110 is formed on the rear surface of the tuyere 100. The cooling air inlet 110 is preferably formed in plural to improve the cooling performance of the tuyere front end portion 101. In this embodiment, a pair of cold air inlet 110 is formed on the rear surface of the tuyere.

도 5a 및 5b에 도시된 바와 같이, 냉풍토출구(120)는 냉풍유입구(110)를 통해 유입된 냉풍이 풍구선단부(101)에 균일하게 토출되도록 풍구선단부(101)로부터 일정간격을 유지하며 외주면을 따라 균일하게 형성된다.As shown in FIGS. 5A and 5B, the cold air discharge outlet 120 maintains a constant distance from the air outlet tip 101 so that cold air introduced through the cold air inlet 110 is uniformly discharged to the air outlet tip 101. Accordingly.

분기유로(130)는 냉풍유입로(110)로부터 분기되어 풍구(100)의 외측면을 따라 냉풍토출구(120)와 각각 연결된다. 따라서, 분기유로(130)는 풍구선단부(101)를 향해 부채형태로 펼쳐진다. 상기 분기유로(130)는 냉풍토출구(120)로 냉풍을 균일하게 전달되도록 동일한 내경을 가지도록 형성되는 것이 바람직하다.Branch passage 130 is branched from the cold air inlet 110 is connected to the cold air outlet 120 along the outer surface of the air port 100, respectively. Therefore, the branch passage 130 extends in a fan shape toward the end of the tuyere 101. The branch passage 130 is preferably formed to have the same inner diameter to uniformly transmit the cold air to the cold air outlet 120.

한편, 풍구(100)의 후면에 형성된 냉각수 유입구(150)는 앞서 종래기술에서 설명된 냉각수 유입구(150)와 동일한 구성 및 작용을 하므로 여기서의 상세한 설명은 생략한다. 아울러, 도시하지는 않았지만 풍구선단부(101)는 하드페이싱 처리가 되어도 무방하다.On the other hand, since the cooling water inlet 150 formed on the rear of the air port 100 has the same configuration and function as the cooling water inlet 150 described in the prior art, a detailed description thereof will be omitted. In addition, although not shown, the tuyere tip portion 101 may be subjected to a hard facing process.

이와 같은 구성으로 이루어진 본 발명에 따른 열손방지용 고로 풍구의 작용을 설명하면 다음과 같다.Referring to the operation of the blast furnace blast furnace for preventing heat loss according to the present invention made of such a configuration as follows.

고로작업이 개시되면, 풍구(100)의 후면에 형성된 냉풍유입구(110)와 냉각수 유입구(150)를 통해 각각 냉풍과 냉각수가 유입된다. 상기 냉풍은 분기유로(130)를 따라 풍구(100)의 외측면을 따라 이동하게 되며 냉풍토출로(130)를 통해 풍구선단부(101)로 강하게 토출된다.When the blast furnace operation is started, through the cold air inlet 110 and the cooling water inlet 150 formed in the rear of the air port 100, the cold wind and the cooling water are introduced. The cold air is moved along the outer surface of the tuyere 100 along the branch passage 130 and is strongly discharged to the tuyere tip portion 101 through the cold air discharge path 130.

따라서, 본발명에 따른 풍구(100)는 냉풍에 의해 풍구선단부(101) 표면이 냉각되며 고로의 내부를 순환하는 냉각수에 의해 풍구(100)의 내부가 냉각되는 이중 냉각과정을 통해 냉각효율이 향상되므로 고로와 밀착된 풍구선단부(101)가 고열에 의해 파손되는 것이 방지될 수 있다.Therefore, the air vent 100 according to the present invention is cooled through the dual cooling process in which the surface of the air vent front end portion 101 is cooled by cold air and the inside of the air vent 100 is cooled by the cooling water circulating inside the blast furnace. Therefore, the tuyere tip portion 101 in close contact with the blast furnace can be prevented from being damaged by high heat.

특히, 풍구선단부(101)로 토출되는 고압의 냉풍은 열풍취입장치(도 1참조)에 의해 고로로 공급되는 열풍의 풍속보다 빠르게 설정하여 고압으로 토출되는 냉풍에 의해 풍구선단부(101)에 용융물 파편들이 접촉되지 않도록 차단시킨다. 이는, 냉풍이 열풍보다 풍속이 약할 경우 풍구선단부(101)에 형성되는 와류로 인해 풍구선단부(101)로 보다 많은 양의 용융물 파편들이 유입되기 때문이다.In particular, the high-pressure cold air discharged to the tuyere tip 101 is set faster than the wind speed of the hot wind supplied to the blast furnace by the hot-air blowing device (see FIG. 1) to debris the melt to the tuyere tip 101 by the cold wind discharged at high pressure. Block them out of contact. This is because, when the cold wind has a lower wind speed than the hot wind, a larger amount of melt fragments are introduced into the tuyere tip 101 due to the vortex formed in the tuyere tip 101.

용융물 파편들이 풍구선단부(101) 표면에 접촉된 경우, 풍구선단부(101)로 토출되는 냉풍 및 풍구선단부(101) 내부를 순환하는 냉각수에 의해 용융물 파편들이 급속히 냉각되므로 풍구선단부(101) 표면에는 용융물 파편들이 융착되지 못하게 되며, 융착되지 못한 용융물 파편들은 냉풍의 토출압에 의해 풍구선단부(101)로부터 떨어져 나가게 된다.When the melt fragments are in contact with the surface of the tuyere tip 101, the melt fragments are rapidly cooled by the cold air discharged to the tuyere tip 101 and the cooling water circulating inside the tuyere tip 101, the melt on the surface of the tuyere 101 The debris is not fused, the melted debris is separated from the tuyere tip portion 101 by the discharge pressure of the cold wind.

한편, 냉풍유입구(110)의 내경, 냉풍유입량, 냉풍토출로(120)의 형성위치 변경 등을 통해 풍구선단부(101)의 냉각성능은 얼마든지 조절될 수 있다.On the other hand, the cooling performance of the tuyere tip portion 101 by changing the inner diameter of the cold air inlet 110, the cold air inflow amount, the formation position of the cold air discharge path 120, etc. can be adjusted to any extent.

또한, 상기 냉풍유입구(110)를 통해 풍구(100)로 유입되는 냉풍은 고로의 상태가 불안정할 경우, 일반 공기가 아닌 불활성 가스인 질소를 취입시킬 수도 있다.In addition, the cold air flowing into the air vent 100 through the cold air inlet 110 may inject nitrogen, which is an inert gas instead of general air, when the blast furnace is unstable.

상기한 바와 같이 구성된 본 발명의 열손방지용 고로 풍구에 따르면, 풍구선단부의 표면에 냉풍을 토출시켜 풍구선단부의 냉각성능을 향상시킴과 동시에 풍구의 선단부가 고로의 고열 및 비정상적인 작업에 의해 발생되는 용융물의 융착에 의한 열손으로부터 보호됨으로써 풍구가 고로의 고열로 인해 열손되는 것이 방지되며, 이로 인해 풍구의 수명이 증대되고 안정된 조업을 수행 할 수 있다.According to the blast furnace tuyere for preventing heat loss of the present invention configured as described above, by discharging the cold air to the surface of the tuyere tip portion to improve the cooling performance of the tuyere tip portion, the tip of the tuyere is generated by the high temperature and abnormal operation of the blast furnace By being protected from heat loss due to fusion, the tuyere is prevented from being damaged due to the high temperature of the blast furnace, thereby increasing the life of the tuyere and performing stable operation.

본 발명은 특정한 실시예에 관련하여 도시하고 설명하였지만, 이하의 특허청구범위에 의해 마련되는 본 발명의 정신이나 분야를 벗어나지 않는 한도 내에서 본 발명이 다양하게 개조 및 변화 될 수 있으며, 이 또한 본 발명의 범위에 포함되어야 한다.While the invention has been shown and described with respect to specific embodiments thereof, it will be understood that the invention can be variously modified and varied without departing from the spirit or scope of the invention as set forth in the claims below. It should be included in the scope of the invention.

Claims (2)

고로조업시 풍구의 열손을 방지하기 위하여 형성되는 냉각수 유입구 및 냉각수로를 가지는 열손방지용 풍구에 있어서,In the blast furnace for preventing heat loss having a cooling water inlet and a cooling water passage formed to prevent heat loss in the blast furnace operation, 풍구(100)의 후면에 형성된 냉풍유입구(110);Cold air inlet 110 formed on the back of the tuyere 100; 풍구선단부(101)측 외주면을 따라 형성된 다수의 냉풍토출구(120); 및A plurality of cold air outlets 120 formed along the outer circumferential surface of the tuyere tip portion 101 side; And 냉풍유입구(110)로부터 분기되어 다수의 냉풍토출구(120)들과 연결된 다수의 분기유로(130)를 포함하는 열손방지용 고로 풍구.Blast furnace for preventing heat damage comprising a plurality of branch passages 130 connected to the plurality of cold air outlet 120 is branched from the cold air inlet 110. 제 1항에 있어서,The method of claim 1, 상기 분기유로(130)는 냉풍토출구(120)로 냉풍을 균일하게 전달되도록 동일한 내경을 가지도록 형성되는 것을 특징으로 하는 열손방지용 고로 풍구.The branch flow path 130 is a blast furnace for heat damage prevention blast furnace, characterized in that it is formed to have the same inner diameter to uniformly transmit the cold air to the cold air outlet 120.
KR1020030028297A 2003-05-02 2003-05-02 Tuyere nozzle for protecting from heating damage by blast furnace KR100962168B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007117061A1 (en) * 2006-04-11 2007-10-18 Seoul Engineering Co., Ltd. Double chamber single directional spiral tuyere for blast furnaces
KR101329795B1 (en) * 2011-12-23 2013-11-15 주식회사 포스코 Tuyere nozzle for blowing air multidirectionally

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5240168Y2 (en) 1973-10-09 1977-09-10

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007117061A1 (en) * 2006-04-11 2007-10-18 Seoul Engineering Co., Ltd. Double chamber single directional spiral tuyere for blast furnaces
KR100783078B1 (en) * 2006-04-11 2007-12-07 주식회사 서울엔지니어링 Double chamber spiral tuyere for blast furnaces
KR101329795B1 (en) * 2011-12-23 2013-11-15 주식회사 포스코 Tuyere nozzle for blowing air multidirectionally

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