KR20080095418A - Apparatus for preventing gas intrusion in annealing furnace - Google Patents

Apparatus for preventing gas intrusion in annealing furnace Download PDF

Info

Publication number
KR20080095418A
KR20080095418A KR1020070039872A KR20070039872A KR20080095418A KR 20080095418 A KR20080095418 A KR 20080095418A KR 1020070039872 A KR1020070039872 A KR 1020070039872A KR 20070039872 A KR20070039872 A KR 20070039872A KR 20080095418 A KR20080095418 A KR 20080095418A
Authority
KR
South Korea
Prior art keywords
annealing furnace
gas
steel sheet
temperature
prevention device
Prior art date
Application number
KR1020070039872A
Other languages
Korean (ko)
Other versions
KR100885884B1 (en
Inventor
신일순
고광후
이만식
장종철
Original Assignee
주식회사 포스코건설
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 포스코건설 filed Critical 주식회사 포스코건설
Priority to KR1020070039872A priority Critical patent/KR100885884B1/en
Publication of KR20080095418A publication Critical patent/KR20080095418A/en
Application granted granted Critical
Publication of KR100885884B1 publication Critical patent/KR100885884B1/en

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/562—Details
    • C21D9/565—Sealing arrangements
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5735—Details
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F27B9/045—Furnaces with controlled atmosphere
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/12—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity with special arrangements for preheating or cooling the charge
    • F27B2009/122—Preheating

Abstract

An apparatus for preventing gas intrusion in annealing furnace is provided to prevent pimple generated in an electric plate by supplying the nitrogen gas to the slot tunnel part located between a radiant heating zone and a direct heating zone in order to cut off ambient gas inflow. A steel sheet passed through a preheating zone, a direct heating zone(30), a slot tunnel(40), a radiant heating zone(50), a soaking zone, a gas jet slow cooling section, a gas jet fast cooling section and a water cooling section in an annealing furnace. An ambient gas cut-off part(110) formed at the lower end of slot tunnel which located between a radiant heating zone and a direct heating zone.

Description

소둔로의 가스혼입 방지장치{Apparatus for preventing gas intrusion in annealing furnace}Apparatus for preventing gas intrusion in annealing furnace}

도 1은 일반적인 전기강판 생산라인의 소둔로를 나타내는 구성도.1 is a block diagram showing an annealing furnace of a general electrical steel sheet production line.

도 2는 일반적인 전기강판 생산라인의 소둔로의 예열대를 나타내는 개략도.Figure 2 is a schematic diagram showing the preheating zone of the annealing furnace of a typical electrical steel sheet production line.

도 3은 본 발명의 일실시예에 따른 소둔로의 가스혼입 방지장치를 나타내는 구성도.Figure 3 is a block diagram showing a gas mixing prevention device of the annealing furnace according to an embodiment of the present invention.

도 4는 본 발명의 일실시예에 따른 소둔로의 가스혼입 방지장치를 나타내는 구조도.Figure 4 is a structural diagram showing a gas mixing prevention device of the annealing furnace according to an embodiment of the present invention.

도 5는 본 발명의 일실시예에 따른 소둔로의 가스혼입 방지장치를 나타내는 단면도.Figure 5 is a cross-sectional view showing a gas mixing prevention device of the annealing furnace according to an embodiment of the present invention.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

10: 입구측 씨링롤 20: 예열대10: inlet sealing ring 20: preheating table

21: 냉각수 공급구 22: 냉각수 배출구21: cooling water supply port 22: cooling water outlet

23: 수냉롤 24: 온도지시조절계23: water cooling roll 24: temperature indicating controller

25: 온도계 30: 직화가열대25: thermometer 30: direct heating

40: 슬로트터널대 50: 복사가열대40: slot tunnel 50: radiant heating table

60: 균열대 70: 가스제트서냉대60: crack zone 70: gas jet slow cooling

80: 가스제트급냉대 90: 수냉대80: gas jet chiller 90: water chiller

100: 강판 110: 질소가스 공급파이프 100: steel plate 110: nitrogen gas supply pipe

본 발명은 소둔로의 가스혼입 방지장치에 관한 것으로서, 보다 상세하게는 전기강판 생산라인의 소둔로에서 직화가열대의 사용시와 미사용시의 병행 조업이 가능하도록 예열대의 수냉롤 결로 발생방지 및 직화가열대와 복사가열대 사이의 로내 분위기가스 혼입을 방지할 수 있는 소둔로의 가스혼입 방지장치에 관한 것이다.The present invention relates to an apparatus for preventing gas mixing in an annealing furnace, and more particularly, to prevent condensation and direct fire of water-cooled rolls in a preheating table so as to enable parallel operation when using or not using a direct heating heater in an annealing furnace of an electrical steel sheet production line. The present invention relates to a gas mixing prevention device of an annealing furnace that can prevent the mixing of atmospheric gas into the furnace between the tropical and radiant heating zones.

철은 상온에서 외력을 받으면 결정립의 변화를 일으켜 소성변형을 이루며 이 과정에서 내부응력이 증가하여 경도가 급격히 증가하게 되며 그 결과 연신율이 저하되고 철강재로써의 유연성이 떨어진다. When iron is subjected to external force at room temperature, it causes a change of grains and forms plastic deformation. In this process, internal stress increases and hardness increases sharply. As a result, elongation is lowered and flexibility as steel is inferior.

특히, 열연 코일을 냉간압연하는 과정에서도 스트립(strip)은 압하 과정에서 높은 잔류응력(저장에너지 또는 내부응력)이 도입되어 경도가 매우높고 연성이 나쁘기 때문에 강재의 용도에 알맞는 형상으로 가공하기에는 어려움이 따른다. In particular, even in the cold rolling process of the hot rolled coil, the strip has a high hardness and poor ductility due to the introduction of high residual stress (storage energy or internal stress) during the rolling process. This follows.

따라서, 이러한 문제점은 냉간압연 스트립을 적당한 온도로 가열하면 되는데 이러한 열처리를 연화소둔이라 칭한다. 즉 냉간압연 스트립을 연화소둔하면 강판의 내부응력이 제거되어 재질이 가공하기 적당한 연성을 가지게 된다.Therefore, this problem is only required to heat the cold rolled strip to a suitable temperature, this heat treatment is called soft annealing. In other words, soft-annealing the cold-rolled strip removes the internal stress of the steel sheet, so that the material has a ductility suitable for processing.

일반적으로 소둔로 열처리 공정은, 냉간 가공된 강판의 가공 스트레스를 해소하여 후공정에서 강판이 취약해지지 않으며 가공성이 용이하도록 일정온도에서 일정시간 유지시킴으로 이루어지며, 소둔로의 주요 공정은 예열단계, 강판을 직접 가열하는 단계, 대류복사열을 이용하여 간접 가열하는 단계, 냉각단계로 구분되며 소둔로 내의 환원성 분위기를 조성하기 위하여 분위기 가스가 충진되어 사용되고 있다.In general, the annealing furnace heat treatment process is performed by relieving the work stress of the cold worked steel sheet, so that the steel sheet is not vulnerable in the post process and is kept at a constant temperature for easy workability. The main processes of the annealing furnace are the preheating stage and the steel sheet. It is divided into direct heating step, indirect heating using convective radiant heat, cooling step, and used to fill the atmosphere gas to create a reducing atmosphere in the annealing furnace.

전기강판은 주로 전기제품 및 전자제품의 철심 재료로 사용되며, 압연방향에 따라서 방향성 전기강판과 무방향성 전기강판으로 크게 나누어진다.Electrical steel sheet is mainly used as iron core material of electrical appliances and electronic products, and is roughly divided into oriented electrical steel sheet and non-oriented electrical steel sheet according to the rolling direction.

방향성 전기강판은 대형(중·소형) 변압기, 배전용 변압기, 리엑터, 소형 전원용변압기, 대형 회전기 등에서 사용되고 있다. Directional electrical steel is used in large (medium and small) transformers, distribution transformers, reactors, small power transformers, and large rotors.

무방향성 전기강판은 대형(중형) 회전기, 범용모터, Compressor용 모터, 소형 정밀모터, 중소형 변압기리엑터, 소형 전원변압기, 안정기, 용접기용 변압기 등에 사용되고 있다. Non-oriented electrical steel is used in large (medium) rotors, general-purpose motors, compressor motors, small precision motors, small and medium-sized transformer reactors, small power transformers, ballasts, transformers for welding machines.

특히, 방향성 전기강판은 결정립의 방위가 (110)[001]방향으로 배향된 집합조직을 가진 전기강판으로서, 압연방향으로 극히 우수한 자기적 특성을 갖기 때문에 변압기, 전동기, 발전기 및 기타 전자기기 등의 철심 재료로 사용된다.In particular, oriented electrical steel sheet is an electrical steel sheet having an aggregate structure in which the orientation of grains is oriented in the (110) [001] direction, and has excellent magnetic properties in the rolling direction, so that transformers, electric motors, generators, and other electronic devices, etc. Used as iron core material.

도 1은 일반적인 전기강판 생산라인의 소둔로를 나타내는 구성도이고, 도 2는 일반적인 전기강판 생산라인의 소둔로의 예열대를 나타내는 개략도이다.1 is a configuration diagram showing an annealing furnace of a general electrical steel sheet production line, Figure 2 is a schematic diagram showing a preheating zone of the annealing furnace of a general electrical steel sheet production line.

일반적인 전기강판 생산라인의 소둔로는, 도 1에 표시된 바와 같이 씨링롤(10), 예열대(2), 직화가열대(30), 슬로트터널대(40), 복사가열대(50), 균열대(60), 가스제트서냉대(70), 가스제트급냉대(80) 및 수냉대(90)로 구성된다.The annealing furnace of the general electrical steel sheet production line, as shown in Figure 1, the sealing roll 10, preheating table 2, direct heating table 30, slot tunnel table 40, radiant heating table 50, It consists of a crack 60, a gas jet slow cooling 70, a gas jet grade cooling 80 and a water cooling 90.

입구측 씨링롤(10)은 대기중의 산소가 로 내로 침입하지 못하도록 씨일기능을 하는 부분이며, 예열대(20)는 직화가열대(30)에서 강판(100)을 가열한 버너의 배기가스가 이동하면서 그 복사열에 의해 강판(100)을 약 250℃까지 예열하는 부분이다. The inlet side sealing roll 10 is a portion that seals the oxygen in the atmosphere to prevent intrusion into the furnace, the preheating table 20 is the exhaust gas of the burner that heated the steel sheet 100 in the direct heating table 30 It is a part which preheats the steel plate 100 to about 250 degreeC by the radiant heat while moving.

직화가열대(30)는 버너를 이용하여 강판(100)을 약 620℃까지 직접가열하는 부분이고, 슬로트터널대(40)는 로의 면적을 좁게하여 약산화성 분위기의 직화가열대(30)와 환원성 분위기의 복사가열대(50) 사이의 분위기가스를 차단시키기 위한 부분이다.The direct heating rack 30 is a portion that directly heats the steel sheet 100 to about 620 ° C. using a burner, and the slot tunnel stand 40 narrows the area of the furnace so that the direct heating rack 30 of the weakly oxidizing atmosphere is used. It is a part for blocking the atmosphere gas between the radiant heating table 50 of the reducing atmosphere.

복사가열대(50)는 내부에 강판(100)의 고온산화를 방지하기 위하여 수소 및 질소를 혼합한 HN 환원성 분위기가스로 채워진 상태에서 복사관(Radiant Tube)을 구비하고 버너를 통해 이를 가열함으로써 유발되는 복사관의 복사열을 이용하여 강판(100)을 소둔온도까지 간접가열하는 부분이다.The radiant heating table 50 is provided with a radiant tube in a state filled with HN reducing atmosphere gas mixed with hydrogen and nitrogen in order to prevent high temperature oxidation of the steel sheet 100 and caused by heating it through a burner. Indirect heating to the annealing temperature of the steel sheet 100 using the radiant heat of the radiant tube.

균열대(60)는 로의 바닥에 전기히터가 설치되어서 HN 환원성 분위기가스 상태에서 일정한 온도로 열처리하는 부분이고, 가스제트서냉대(70)는 HN 환원성 분위기가스를 열교환기로 냉각시켜 노즐을 통해 강판(100) 표면에 분사하여 강판을 냉각하는 부분이다.The crack zone 60 is an electric heater installed at the bottom of the furnace to heat-treat at a constant temperature in the HN reducing atmosphere gas state, the gas jet slow cooling table 70 cools the HN reducing atmosphere gas with a heat exchanger through a steel plate (the nozzle) 100) It is a part to cool the steel plate by spraying on the surface.

가스제트급냉대(80)는 질소 분위기가스 상태에서 열교환기로 냉각시켜 노즐 을 통해 강판(100) 표면에 분사하여 강판을 냉각하는 부분이고, 수냉대(90)는 강판을 물에 침적하여 스프레이노즐을 통해 냉각수를 분사하여 목적하는 온도까지 냉각하는 부분이다.The gas jet cooler 80 is a part for cooling the steel plate by spraying the surface of the steel plate 100 through a nozzle by cooling with a heat exchanger in a nitrogen atmosphere gas state, and the water cooling unit 90 deposits a spray nozzle by depositing the steel plate in water. It is a part to cool the target temperature by spraying the coolant through.

특히, 입구측 씨링롤(10)은 로 내부로 대기중의 산소가 침입하는 것을 방지하지위한 설비이고, 예열대(20)는 직화가열대(30)의 고온의 폐열을 이용한 강판을 예열시키는 구간이다. In particular, the inlet side sealing roll 10 is a facility for preventing the ingress of oxygen in the atmosphere into the furnace, the preheating zone 20 is a section for preheating the steel sheet using the high-temperature waste heat of the direct heating table 30 to be.

도 1 및 도 2에 표시된 바와 같이, 직화가열대(30)를 사용하는 경우에는 예열대(20)의 로 내부 온도가 항상 400℃정도로 유지되므로 로내의 수냉롤(23)에 냉각수를 일정유량을 보내주게 되지만, 직화가열대(30)를 사용하지 않을 경우에는 로 내부온도가 100℃미만이 되어서 씨일롤(10)과 예열대(20)의 수냉롤(23)의 표면에 결로가 발생되므로, 로 내부를 습한 분위기로 만들어서 강판 표면에 핌플(pimple) 등과 같은 표면결함을 발생시키게 된다.As shown in FIG. 1 and FIG. 2, when the direct heating rack 30 is used, the internal temperature of the furnace of the preheating rack 20 is always maintained at about 400 ° C., so that a constant flow rate of cooling water is applied to the water cooling roll 23 in the furnace. However, when the direct heating rack 30 is not used, condensation occurs on the surfaces of the seal roll 10 and the water cooling roll 23 of the preheating table 20 when the furnace internal temperature is less than 100 ° C. The inside of the furnace is moist to produce surface defects such as pimples on the surface of the steel sheet.

또한, 직화가열대(30)를 사용시 또는 미사용시의 병행조업시, 직화가열대(30)는 약산화성 분위기이고, 복사가열대(50)는 수소 및 질소를 혼합한 HN 환원성 분위기가스이므로, 직화가열대(30)의 약산화성 분위기가 환원성 분위기의 복사가열대(50) 쪽으로 혼입되면 산소농도가 높아져서, 로 내부의 건조한 분위기를 습한 분위기로 악화시켜 강판 표면에 핌플 등과 같은 표면결함을 발생시키게 된다.In addition, when the direct heating stand 30 is used or not in parallel operation, the direct heating stand 30 is a weakly oxidizing atmosphere, and the radiant heating stand 50 is an HN reducing atmosphere gas in which hydrogen and nitrogen are mixed. When the weakly oxidizing atmosphere of the heating table 30 is mixed toward the radiant heating table 50 of the reducing atmosphere, the oxygen concentration is increased, thereby deteriorating the dry atmosphere inside the furnace to a humid atmosphere, thereby causing surface defects such as pimples on the surface of the steel sheet. .

따라서, 로 내부의 압력제어를 직화가열대(30) 보다 복사가열대(50) 쪽을 높게 관리하는데 정밀한 제어관리가 필요하나, 이러한 제어관리에는 한계가 있어 필수적으로 복사가열대(50)쪽에 직화가열대(30)의 약산화성 분위기가 혼입이 되어, 강판 표면에 결함이 발생되는 문제점이 있었다.Therefore, precise control management is required to manage the pressure control inside the furnace higher than the radiant heating table 30 than the direct heating table 30, but such control management has limitations, so it is essential that the radiant heating table 50 is directly fired. There was a problem that the weak oxidizing atmosphere of the heating table 30 is mixed, so that a defect occurs on the surface of the steel sheet.

본 발명은 상기와 같은 종래의 문제점을 해소하기 위해 안출한 것으로서, 직화가열대와 복사가열대 중간의 슬로트터널부에 질소가스를 공급하여 분위기가스 혼입을 차단시킴으로서 전기강판에 핌플의 발생을 방지할 수 있고, 제품의 품질향상과 불량제품의 감소로 생산성 향상시킬 수 있고, 또한, 입구측 씨링롤과 예열대 수냉롤의 냉각수 회수온도를 일정온도 이상으로 일정하게 제어하여 결로현상을 방지함으로서 핌플 발생이 없어지고, 강판 표면제품 불량을 최소화하여 전기강판의 품질을 향상시키고, 롤의 교체 등 보수비용을 절감할 수 있는 소둔로의 가스혼입 방지장치를 제공하는 것을 그 목적으로 한다. The present invention has been made in order to solve the above-mentioned conventional problems, by supplying nitrogen gas to the slot tunnel portion between the direct heating and radiant heating zone to prevent the mixing of the atmosphere gas to prevent the generation of pimples. It is possible to improve productivity by improving the quality of the product and reducing the defective products, and also to prevent condensation by controlling the cooling water recovery temperature of the inlet sealing ring and the preheating water cooling roll to a certain temperature or higher. It is an object of the present invention to provide an apparatus for preventing gas mixing in an annealing furnace which eliminates occurrence, minimizes defects on steel sheet surface products, improves the quality of electrical steel sheets, and reduces maintenance costs such as replacement of rolls.

상기와 같은 목적을 달성하기 위한 본 발명은, 강판이 예열대(20), 직화가열대(30), 슬로트터널대(40), 복사가열대(50), 균열대(60), 가스제트서냉대(70), 가스제트급냉대(80), 수냉대(90)를 순차적으로 통과하도록 구성된 강판 생산라인의 소둔로에 있어서, 상기 직화가열대(30)와 복사가열대(50)와의 사이에 설치된 슬로트터널대(40)의 하단에 분위기가스 차단부가 형성되어 있는 것을 특징으로 한다.The present invention for achieving the above object, the steel sheet is preheating 20, direct heating 30, slot tunnel 40, radiant heating 50, crack 60, gas jet In the annealing furnace of the steel sheet production line configured to sequentially pass through the slow cooling table 70, the gas jet grade cooling table 80, and the water cooling table 90, between the direct heating table 30 and the radiant heating table 50. Atmospheric gas blocking portion is formed on the lower end of the slot tunnel 40 installed in the.

보다 바람직하게, 상기 차단부는, 슬로트터널대(40)의 하단에 설치된 질소가스 공급파이프(110)로 이루어진 것을 특징으로 한다.More preferably, the blocking unit, characterized in that consisting of the nitrogen gas supply pipe 110 installed on the lower end of the slot tunnel 40.

보다 바람직하게, 상기 질소가스 공급파이프(110)는 상측부에 복수의 공급홀(111)이 천공되어 있는 것을 특징으로 한다.More preferably, the nitrogen gas supply pipe 110 is characterized in that a plurality of supply holes 111 are perforated in the upper portion.

보다 바람직하게, 상기 차단부는, 슬로트터널대(40)의 상단에 설치되며 강판의 상면을 차단하는 씨일게이트(43)를 더 포함하여 이루어진 것을 특징으로 한다.More preferably, the blocking portion is installed on the upper end of the slot tunnel 40, characterized in that it further comprises a seal gate 43 for blocking the upper surface of the steel sheet.

보다 바람직하게, 상기 예열대(20)의 내부에는 수냉롤(23)이 설치되고, 수냉롤(23)에는 냉각수 공급구(21)와 배출구(22)가 연통되되, 배출구(22) 측에 온도계(25)와 온도지시조절계(24)가 설치되어 냉각수의 온도를 소정온도로 일정하게 유지하는 것을 특징으로 한다.More preferably, the water cooling roll 23 is installed in the preheating table 20, and the cooling water supply port 21 and the outlet 22 communicate with the water cooling roll 23, and the thermometer is disposed on the outlet 22 side. Reference numeral 25 and the temperature indicating control system 24 is installed to keep the temperature of the cooling water constant at a predetermined temperature.

이하, 첨부도면을 참조하여 본 발명의 바람직한 일실시예를 더욱 상세히 설명한다. Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

도 3은 본 발명의 일실시예에 따른 소둔로의 가스혼입 방지장치를 나타내는 구성도이고, 도 4는 본 발명의 일실시예에 따른 소둔로의 가스혼입 방지장치를 나타내는 구조도이고, 도 5는 본 발명의 일실시예에 따른 소둔로의 가스혼입 방지장치를 나타내는 단면도이다.Figure 3 is a block diagram showing a gas mixing prevention device of the annealing furnace according to an embodiment of the present invention, Figure 4 is a structural diagram showing a gas mixing prevention device of the annealing furnace according to an embodiment of the present invention, Figure 5 Sectional drawing which shows the gas mixing prevention apparatus of the annealing furnace which concerns on one Embodiment of this invention.

도 1에 표시된 바와 같이, 본 실시예의 소둔로는, 강판(100)이 입구측 씨링롤(10)을 통해서 가열로의 내부로 인입되어 예열대(20), 직화가열대(30), 슬로트터널대(40), 복사가열대(50) 및 전기히터의 균열대(60)를 통과하면서 소둔온도까지 가열된다. As shown in Figure 1, the annealing furnace of the present embodiment, the steel sheet 100 is introduced into the interior of the heating furnace through the inlet-side sealing roll 10 to preheat 20, direct heating 30, slot It is heated to the annealing temperature while passing through the tunnel table 40, the radiant heating table 50, and the crack table 60 of the electric heater.

야금학적으로 요구되는 소둔온도까지 가열된 강판은 가스제트서냉대(70), 가 스제트급냉대(80)및 수냉대(90)를 지나면서 소둔로의 열처리를 마치게 되는 공정으로 이루어진다.The steel sheet heated to the annealing temperature required by the metallurgical process consists of a process of finishing the heat treatment of the annealing furnace while passing through the gas jet slow cooling table 70, the gas jet subcooling table 80, and the water cooling table 90.

본 실시예의 소둔로의 가스혼입 방지장치는, 도 4 및 도 5에 표시된 바와 같이, 상기 직화가열대(30)와 복사가열대(50)와의 사이에 설치된 슬로트터널대(40)의 하단에 분위기가스 차단부가 형성되어 있다.The gas mixing prevention device of the annealing furnace of the present embodiment, as shown in Figures 4 and 5, at the lower end of the slot tunnel 40 is provided between the direct heating table 30 and the radiant heating table (50). Atmospheric gas cutoff is formed.

이러한 분위기가스 차단부는, 직화가열대(30)와 복사가열대(50)와의 사이에 연결된 슬로트터널대(40)에 저압의 질소(N2)가스를 상시 소정량, 예를들면 50 Nm3/hr으로 공급함으로써 양쪽의 분위기가스 혼입을 차단시켜 강판의 표면결함인 핌플의 발생을 억제시킴으로써 전기강판의 표면품질을 향상시킬 수 있게 된다.The atmosphere gas blocking unit is a predetermined amount of low-pressure nitrogen (N 2 ) gas in the slot tunnel 40 connected between the direct heating table 30 and the radiant heating table 50, for example, 50 Nm 3 It is possible to improve the surface quality of the electrical steel sheet by suppressing the generation of pimples, which are surface defects of the steel sheet, by blocking the mixing of atmospheric gases on both sides by supplying / hr.

예를 들면, 이러한 차단부로는, 슬로트터널대(40)의 하단에 로 외부로 돌출된 프랜지(112)와 로 내부의 하우징(113)을 개재해서 횡방향으로 설치된 질소가스 공급파이프(110)로 이루어지는 것이 바람직하고, 질소가스 공급파이프(110)의 상측부에 복수의 공급홀(111)이 천공되어 있는 것이 더욱 바람직하다.For example, as the blocking unit, the nitrogen gas supply pipe 110 installed laterally via a flange 112 protruding out of the furnace at the lower end of the slot tunnel 40 and a housing 113 inside the furnace. It is preferable that the plurality of supply holes 111 are formed in the upper portion of the nitrogen gas supply pipe 110.

따라서, 질소가스 공급파이프(110)의 일단에서 질소가스가 공급되고, 복수의 공급홀(111)을 개재해서 질소가스가 슬로트터널대(40)의 하단에서 상측으로 배출되어 차단막을 형성하게 된다. 이 질소가스 차단막은 양쪽의 분위기가스가 혼입하지 않도록 커튼역할을 해줌으로써 강판 표면의 핌플발생을 억제시킬 수 있게 된다.Therefore, nitrogen gas is supplied from one end of the nitrogen gas supply pipe 110, and nitrogen gas is discharged upward from the lower end of the slot tunnel stage 40 through the plurality of supply holes 111 to form a blocking film. . This nitrogen gas barrier film acts as a curtain to prevent both atmosphere gases from mixing, thereby suppressing the occurrence of pimples on the surface of the steel sheet.

또한, 차단부는, 슬로트터널대(40)의 상단에 설치되며 에어실린더에 의해 상하로 이송이 가능하여 강판의 상면을 차단하는 씨일게이트(Seal Gate; 43)를 더 포 함하여 이루어지는 것이 바람직하다.In addition, the blocking unit is preferably formed on the upper end of the slot tunnel 40, and further comprises a seal gate (43) to be transported up and down by the air cylinder to block the upper surface of the steel sheet. .

따라서, 소둔로를 따라서 진행하는 강판의 상부 및 하부를 질소가스와 씨일게이트(43)로 차단함으로써, 직화가열대(30)와 복사가열대(50)의 분위기가스를 차단할 수 있게 된다.Therefore, by blocking the upper and lower portions of the steel sheet running along the annealing furnace with nitrogen gas and the seal gate 43, it is possible to block the atmospheric gas of the direct heating table 30 and the radiant heating table 50.

또한, 슬로트터널대(40) 입구측과 씨일게이트(43) 후단에 내화벽돌로 단차를 형성하여 강판과 슬로트터널대(40)와의 사이의 간격을 최소화함으로써 분위기가스의 차단을 용이하게 할 수 있게 된다.In addition, by forming a step with a refractory brick at the inlet side of the slot tunnel stand 40 and the rear end of the seal gate 43, the gap between the steel plate and the slot tunnel stand 40 can be minimized to facilitate the blocking of atmospheric gas. It becomes possible.

특히, 직화가열대(30)를 미사용하는 경우에는 예열대(20)의 로내 온도가 100℃ 미만의 상태가 되어서 수냉롤(23)의 표면에 결로가 발생되고 강판표면에 핌플의 표면결함을 야기시키게 된다.In particular, when the direct heating rack 30 is not used, the furnace temperature of the preheating table 20 becomes less than 100 ° C., causing condensation to occur on the surface of the water-cooling roll 23 and causing surface defects of the pimple on the surface of the steel sheet. Let's go.

따라서, 본 실시예의 전기강판 생산라인의 소둔로에서 직화가열대(30)의 사용시와 미사용시의 병행 조업이 가능하도록, 소둔로 입구측 씨일롤(10)과 예열대(20)의 수냉롤(23) 이슬점 발생을 방지하여, 직화가열대(30)의 미사용시 수냉롤(23) 표면에 결로 발생을 방지하게 된다.Accordingly, the water-cooled rolls of the annealing furnace inlet seal roll 10 and the preheating table 20 may be operated in the annealing furnace of the electrical steel sheet production line of the present embodiment to enable parallel operation when the direct heating table 30 is used or not. 23) By preventing the dew point, condensation is prevented on the surface of the water cooling roll 23 when the direct heating table 30 is not used.

도 3에 표시된 바와 같이, 예열대(20)의 내부에 설치된 수냉롤(23)에는 냉각수 공급구(21)와 배출구(22)가 연통되며, 배출구(22) 측에 온도계(25)와 온도지시조절계(24)가 설치되어 냉각수의 온도를 소정온도로 일정하게 제어하는 것이 바람직하다.As shown in FIG. 3, the cooling water supply port 21 and the discharge port 22 communicate with the water cooling roll 23 installed in the preheating table 20, and the temperature indicator 25 and the temperature indication on the discharge port 22 side. It is preferable that the controller 24 is installed to control the temperature of the cooling water to a predetermined temperature.

즉, 직화가열대(30)의 미사용시에 입구측 씨링롤(10)과 예열대(20)의 수냉롤(23)에 결로의 발생을 방지할 수 있도록, 수냉롤(23)의 냉각수 배출구(22) 파이 프에 냉각수의 온도를 측정하는 온도계(TE; 25)와 냉각수의 온도를 제어하는 온도지시조절계(TIC; 24)를 설치하여 수냉롤(23)의 냉각수의 온도를 제어할 수 있게 된다.That is, the cooling water discharge port of the water cooling roll 23 so as to prevent the occurrence of condensation on the water cooling roll 23 of the inlet side ring roll 10 and the preheating table 20 when the direct heating table 30 is not used. 22) The temperature of the cooling water of the water cooling roll 23 can be controlled by installing a thermometer (TE) 25 for measuring the temperature of the cooling water and a temperature indicating controller (TIC) 24 for controlling the temperature of the cooling water. .

특히, TIC(Temperature Indicating Controller)는, 온도지시조절계로서 초기온도 설정값(Set Value)과 실제 측정값(Process Value)의 데이터를 수신하여, TIC 연산기에서 연산해서 보정된 조정값(Manipulated Value)을 지령하는 콘트롤러이다.In particular, the TIC (Temperature Indicating Controller) receives the data of the initial temperature set value and the actual measured value as a temperature indicating controller, and calculates the adjusted value calculated by the TIC calculator. Command controller.

TE(Temperature Element)는 통상 온도계를 지칭하나, 그 종류는 열전대(TC; Thermocouple), 측온저항체(RTD; Resistance Temperature Detector), 판온 측정 온도계(Pyrometer) 등이 있으며, 본 실시예의 온도계로는 측온저항체를 사용하는 것이 바람직하다.TE (Temperature Element) generally refers to a thermometer, but the type thereof includes a thermocouple (TC), a resistance temperature detector (RTD), a plate temperature measuring thermometer (Pyrometer), and the like. Preference is given to using.

냉각수 배출구(22)의 온도를 온도계(25)로 측정하여 중앙운전실의 분산제어시스템에 데이터를 전송하게 되면, 수냉롤(23)에 결로가 발생되지 않는 일정 온도이상으로 유지되도록 온도 조절밸브의 개도량를 제어하게 된다.When the temperature of the cooling water outlet 22 is measured by the thermometer 25 and data is transmitted to the distributed control system of the central cab, the temperature control valve is opened so that the water cooling roll 23 is kept above a predetermined temperature without condensation. To control the metering.

즉, 예열대(20)를 통과한 강판이 수냉롤(23)과 접촉시 수냉롤(23)의 냉각수온도를 이용해서 회수되는 냉각수의 양을 조절해줌으로써 수냉롤(23) 표면에 결로를 방지시켜서 수냉롤(23)의 표면상태를 양호하게 유지할 수 있게 된다.That is, when the steel sheet passing through the preheating table 20 is in contact with the water cooling roll 23, the condensation is prevented on the surface of the water cooling roll 23 by adjusting the amount of cooling water recovered by using the cooling water temperature of the water cooling roll 23. By doing so, the surface state of the water cooling roll 23 can be maintained satisfactorily.

이상 설명한 본 발명은 그 기술적 사상 또는 주요한 특징으로부터 벗어남이 없이 다른 여러 가지 형태로 실시될 수 있다. 따라서 상기 실시예는 모든 점에서 단순한 예시에 지나지 않으며 한정적으로 해석되어서는 안 된다. The present invention described above can be embodied in many other forms without departing from the spirit or main features thereof. Therefore, the above embodiments are merely examples in all respects and should not be interpreted limitedly.

이상에서 살펴본 바와 같이, 본 발명은 직화가열대와 복사가열대 중간의 슬로트터널부에 질소가스를 공급하여 분위기가스 혼입을 차단시킴으로서 전기강판에 핌플의 발생을 방지할 수 있고, 제품의 품질향상과 불량제품의 감소로 생산성 향상시킬 수 있는 효과를 제공한다.As described above, the present invention can prevent the generation of pimples on the electrical steel sheet by supplying nitrogen gas to the slot tunnel between the direct heating zone and the radiant heating zone to block the atmosphere gas mixing, and improve the quality of the product. It provides the effect of improving the productivity by reducing the number of defective products.

또한, 입구측 씨링롤과 예열대 수냉롤의 냉각수 회수온도를 일정온도 이상으로 일정하게 제어하여 결로현상을 방지함으로서 핌플 발생이 없어지고, 전기강판 표면제품 불량을 최소화하여 전기강판의 품질을 향상시키고, 롤의 교체 등 보수비용을 절감할 수 있는 효과를 제공한다.In addition, by controlling the cooling water recovery temperature of the inlet-side sealing roll and the preheating water cooling roll to a certain temperature or more to prevent condensation, pimples are eliminated, and the quality of electrical steel sheet is improved by minimizing defects on the surface of electrical steel sheet. In addition, it provides the effect of reducing maintenance costs such as replacement of rolls.

Claims (5)

강판이 예열대(20), 직화가열대(30), 슬로트터널대(40), 복사가열대(50), 균열대(60), 가스제트서냉대(70), 가스제트급냉대(80), 수냉대(90)를 순차적으로 통과하도록 구성된 강판 생산라인의 소둔로에 있어서, Steel plate preheating 20, direct heating 30, slot tunnel 40, radiant heating 50, cracks 60, gas jet slow cooling (70), gas jet cooling cold (80) In the annealing furnace of the steel plate production line configured to sequentially pass through the water cooling stand 90, 상기 직화가열대(30)와 복사가열대(50)와의 사이에 설치된 슬로트터널대(40)의 하단에 분위기가스 차단부가 형성되어 있는 것을 특징으로 하는 소둔로의 가스혼입 방지장치.The gas mixing prevention device of the annealing furnace, characterized in that the atmosphere gas blocking unit is formed at the lower end of the slot tunnel (40) installed between the direct heating table 30 and the radiant heating table (50). 제 1 항에 있어서,The method of claim 1, 상기 차단부는, 슬로트터널대(40)의 하단에 설치된 질소가스 공급파이프(110)로 이루어진 것을 특징으로 하는 소둔로의 가스혼입 방지장치.The blocking unit, the gas mixing prevention device of the annealing furnace, characterized in that consisting of the nitrogen gas supply pipe 110 installed on the lower end of the slot tunnel (40). 제 2 항에 있어서,The method of claim 2, 상기 질소가스 공급파이프(110)는 상측부에 복수의 공급홀(111)이 천공되어 있는 것을 특징으로 하는 소둔로의 가스혼입 방지장치.The nitrogen gas supply pipe 110 is a gas mixing prevention device of the annealing furnace, characterized in that a plurality of supply holes 111 are perforated in the upper side. 제 2 항에 있어서,The method of claim 2, 상기 차단부는, 슬로트터널대(40)의 상단에 설치되며 강판의 상면을 차단하는 씨일게이트(43)를 더 포함하여 이루어진 것을 특징으로 하는 소둔로의 가스혼입 방지장치.The blocking unit is installed on the upper end of the slot tunnel 40, the gas mixing prevention device of the annealing furnace, characterized in that further comprises a seal gate (43) for blocking the upper surface of the steel sheet. 제 1 항 내지 제 4 항중 어느 한항에 있어서, The method according to any one of claims 1 to 4, 상기 예열대(20)의 내부에는 수냉롤(23)이 설치되고, 수냉롤(23)에는 냉각수 공급구(21)와 배출구(22)가 연통되되, 배출구(22) 측에 온도계(25)와 온도지시조절계(24)가 설치되어 냉각수의 온도를 소정온도로 일정하게 유지하는 것을 특징으로 하는 소둔로의 가스혼입 방지장치.The water cooling roll 23 is installed inside the preheating table 20, and the cooling water supply port 21 and the outlet 22 communicate with the water cooling roll 23, and the thermometer 25 and A temperature indicating control system (24) is installed, the gas mixing prevention device of the annealing furnace, characterized in that to maintain a constant temperature of the cooling water at a predetermined temperature.
KR1020070039872A 2007-04-24 2007-04-24 Apparatus for preventing gas intrusion in annealing furnace KR100885884B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070039872A KR100885884B1 (en) 2007-04-24 2007-04-24 Apparatus for preventing gas intrusion in annealing furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070039872A KR100885884B1 (en) 2007-04-24 2007-04-24 Apparatus for preventing gas intrusion in annealing furnace

Publications (2)

Publication Number Publication Date
KR20080095418A true KR20080095418A (en) 2008-10-29
KR100885884B1 KR100885884B1 (en) 2009-02-26

Family

ID=40155080

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070039872A KR100885884B1 (en) 2007-04-24 2007-04-24 Apparatus for preventing gas intrusion in annealing furnace

Country Status (1)

Country Link
KR (1) KR100885884B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101243125B1 (en) 2010-09-15 2013-03-12 주식회사 포스코 Apparatus for feeding and stabilizing atmospheregas of tube furnace for continuous decarburizing and nitriding
KR101271809B1 (en) * 2010-12-21 2013-06-07 주식회사 포스코 Heating method for steel material of producing wire for reducing high temperature scale

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59166628A (en) 1983-03-08 1984-09-20 Chugai Ro Kogyo Kaisha Ltd Continuous annealing furnace for strip
JPH06207226A (en) * 1993-01-08 1994-07-26 Sumitomo Metal Ind Ltd Directly firing continuous annealing furnace
JP3094793B2 (en) * 1994-06-22 2000-10-03 日本鋼管株式会社 Direct fire furnace preheating furnace inlet sealing method and apparatus
JPH08199246A (en) * 1995-01-20 1996-08-06 Sumitomo Metal Ind Ltd Continuous annealing furnace

Also Published As

Publication number Publication date
KR100885884B1 (en) 2009-02-26

Similar Documents

Publication Publication Date Title
WO1996032507A1 (en) Equipment for manufacturing stainless steel strip
US9783867B2 (en) Method and apparatus for controlling the strip temperature of the rapid cooling section of a continuous annealing line
JP2008196015A (en) Continuous annealing facility
US6341955B1 (en) Sealing apparatus in continuous heat-treatment furnace and sealing method
WO1999050464A1 (en) Continuous heat treating furnace and atmosphere control method and cooling method in continuous heat treating furnace
KR20090025218A (en) Method for controlling a metal strip in a heat treatment furnace
KR100885884B1 (en) Apparatus for preventing gas intrusion in annealing furnace
KR20090030515A (en) Heater for annealing furnace
KR101654158B1 (en) Apparatus for heating slow cooling section in continuous annealing furnace
JP2007092140A (en) Method for operating soaking pit in facility for continuously treating steel strip, and soaking pit
JP6436309B2 (en) Temperature control device and temperature control method for metal strip in continuous annealing equipment
US5192485A (en) Continuous annealing line having carburizing/nitriding furnace
CN107964643A (en) Hot-strip continuous hot galvanizing device and method
JP3083247B2 (en) Method for producing stainless steel strip by continuous casting hot rolling and heat treatment furnace for continuous casting hot rolling of stainless steel strip
CN202595217U (en) Band steel cooling system
JP3334544B2 (en) Warm slitting method and equipment for high silicon steel strip
CN103589853A (en) Horizontal continuous annealing furnace for annealing titanium belt and steel belt
JP2000192151A (en) Seal roll device of continuous heat treatment furnace and sealing method thereof
JP4088115B2 (en) Steel strip cooling control method
KR100775266B1 (en) Apparatus for prevent trouble of strip in kiln
KR101277922B1 (en) Material heating apparatus and control method thereof
JP2004217979A (en) Forcible convection type cooling method for steel strip in continuous type heat treatment facility and its apparatus
KR20110047049A (en) Temperature control apparatus of skid beam
KR100946072B1 (en) An apparatus for cooling a strip in annealing furnace
EP2915887B1 (en) Apparatus for the treatment of a metal strip in a vertical annealing plant

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20130201

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20140203

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20150202

Year of fee payment: 7

FPAY Annual fee payment

Payment date: 20160201

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20170201

Year of fee payment: 9

FPAY Annual fee payment

Payment date: 20180201

Year of fee payment: 10

FPAY Annual fee payment

Payment date: 20190207

Year of fee payment: 11

FPAY Annual fee payment

Payment date: 20200203

Year of fee payment: 12