KR970007154B1 - Back flow method of molten metal with vaccum degasification device - Google Patents
Back flow method of molten metal with vaccum degasification device Download PDFInfo
- Publication number
- KR970007154B1 KR970007154B1 KR1019940036421A KR19940036421A KR970007154B1 KR 970007154 B1 KR970007154 B1 KR 970007154B1 KR 1019940036421 A KR1019940036421 A KR 1019940036421A KR 19940036421 A KR19940036421 A KR 19940036421A KR 970007154 B1 KR970007154 B1 KR 970007154B1
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- molten steel
- reflux
- coil
- electromagnetic force
- vacuum degassing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- 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
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/167—Introducing a fluid jet or current into the charge the fluid being a neutral gas
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- 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
- F27D27/00—Stirring devices for molten material
- F27D2027/002—Gas stirring
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
본 발명의 목적은 진공 탈가스 설비의 용강 환류속도를 상승시켜 탈탄 시간을 줄임으로써 용강중의 가스제거 속도를 향상시켜 양질의 철강제품을 생산할 수 있도록 한 교류에 의한 전자기력을 이용한 진공 탈가스 장치의 용강가속 환류장치를 제공하는데 있다.It is an object of the present invention to increase the molten steel reflux rate of the vacuum degassing equipment to reduce the decarburization time, thereby improving the gas removal rate in the molten steel to produce high-quality steel products. An accelerated reflux device is provided.
본 발명의 특징은 베셀의 상승관의 둘레에 상향의 로렌쯔력(포스)이 형성되도록 코일과 코어를 장착하고, 여기에 교류전류를 흘려줌으로써 래들로부터의 용강이 빠른 속도로 상승하게 한다는데 있다.A feature of the present invention is to mount a coil and a core so that an upward Lorentz force (force) is formed around the riser of the vessel, and the molten steel from the ladle rises rapidly by flowing an alternating current thereto.
나. 발명의 구성 및 작용I. Composition and Function of the Invention
이하에서는 첨부한 도면을 참고로 하여 본 발명을 설명하고자 한다.Hereinafter, the present invention will be described with reference to the accompanying drawings.
도2는 본 발명에 따른 용강가속 환류장치의 개념 설명도로써, 베셀(9)의 상승관(2)쪽에 전자기력 발생장치(10)를 설치하되 그의 로렌쯔력이 상향하는 방향으로 형성되게 설치한 것을 보이고 있다.Figure 2 is a conceptual explanatory diagram of the molten steel acceleration reflux device according to the present invention, the electromagnetic force generating device 10 is installed on the riser (2) side of the vessel (9) while the Lorentz force is installed so as to be formed in a direction upwards It is showing.
도3의 (a) 및 (b)는 본 발명의 구체적인 실시예를 설명하기 위한 수직단면도 및 그의 A-A'선 수평단면도를 나타내고 있다.3 (a) and 3 (b) show a vertical cross-sectional view for explaining a specific embodiment of the present invention and a horizontal cross-sectional view along the line A-A 'thereof.
여기에서 참고되는 바와 같이, 상승관(2)의 둘레에는 수 개의 코일(12)을 배치하고, 이 코일의 둘레에 코어(11)를 배치하여 용강가속장치를 구성하고 여기에 원하는 방향으로의 로렌쯔력이 발생되도록 교류전류를 인가한다.As referred to herein, several coils 12 are arranged around the riser 2, and a core 11 is disposed around the coils to form a molten steel accelerator, and Lorentz in the desired direction. Apply alternating current to generate power.
통상적으로 널리 알려진 기술로써 용강의 유동속도를 감속시키고자 하는 경우에는 직류의 전자기력을 용강에 흐름을 억제하게 된다.In general, in order to reduce the flow rate of molten steel by a widely known technique, the electromagnetic force of direct current is suppressed to the molten steel.
즉, 직류자기력에 의한 로렌쯔력(F)은 자속밀도(B)와 전류밀도(J)에 수직한 방향으로 나타나게 되는데, 이를 이용함으로써 용강속을 저감시킬 수 있다.That is, the Lorentz force (F) by the DC magnetic force appears in a direction perpendicular to the magnetic flux density (B) and the current density (J), by using this can reduce the molten steel speed.
이러한 직류 자기력하에서 로렌쯔력의 세기는 아래의 식으로 표현되며 그 세기의 조절은 자속밀도로서 조정하게 된다.Under this DC magnetic force, the intensity of the Lorentz force is expressed by the following equation and the adjustment of the intensity is adjusted as the magnetic flux density.
F(로렌쯔력)=B×JF (Lorentz force) = B × J
그러나 상기의 직류 자기력하에서 용강의 환류방향과 같은 방향으로 로렌쯔력을 유도할 수는 없기 때문에 본 발명에서는 교류자기를 용강중에 인가하여 파라데이 법칙에 의해 로렌쯔력을 용강의 유동방향과 일치시켜 소기의 목적을 달성시키고자 한다.However, since the Lorentz force cannot be induced in the same direction as the reflux direction of the molten steel under the direct current magnetic force, in the present invention, by applying the alternating magnetic force in the molten steel, the Lorentz force is matched with the flow direction of the molten steel by Faraday's law. I want to achieve my purpose.
이를 식으로 나타내면 아래와 같다.This is expressed as follows.
여기에서는 전기장세기이고,는 전기 변위이다.From here Is the electric field strength, Is the electrical displacement.
한편, 진공 탈가스 설비의 전자기력 발생장치(10)는 크게 코일(12)과 코어(11)로 구성되어서 용강의 환류방향과 수직으로 설치되게 되는데, 이들 코일(12)과 코어(11)의 갯수는 베셀(9)과 래들(5)사이의 공간에 따라 그설치 수에 제한이 따르게 된다. 특히 코일(12)간 위상차 발생이 필요하기 때문에 코일을 3개 이상으로 설치하는 것이 바람직하다.On the other hand, the electromagnetic force generating device 10 of the vacuum degassing equipment is composed of a coil 12 and the core 11 largely installed perpendicular to the reflux direction of the molten steel, the number of these coils 12 and the core 11 As the space between the vessel 9 and the ladle 5 is limited in the number of installation. In particular, it is preferable to provide three or more coils because phase difference generation between the coils 12 is required.
통상 코어에 인가되는 자장의 세기는 코어의 재질, 코일의 권선수 및 전류값에 의해 정해지게 되는데, 본 발명의 실험예에서는 자장을 발생하기 위한 주파수는 최대 7Hz로 설정하고 저류치는 600A 이상으로 설계하였다.In general, the strength of the magnetic field applied to the core is determined by the material of the core, the number of turns of the coil, and the current value. In the experimental example of the present invention, the frequency for generating the magnetic field is set to a maximum of 7 Hz and the storage value is designed to be 600 A or more. It was.
또한 상기한 자장세기의 결정 요소들을 복합적으로 고려하여 용강에 작용하는 자장의 세기가 3000 가우스(Gauss) 이상이 되도록 설계하였을 때 가속 환류 효과가 나타났다.In addition, in consideration of the above-mentioned determinants of the magnetic field strength, the accelerated reflux effect appeared when the magnetic field acting on the molten steel was designed to be more than 3000 Gauss.
따라서 가스를 탈가스 설비의 침적관중 상승관에 주입하여 가스의 상승력(부력)에 의해 용강의 환류를 실시할 때 전자기력을 이용한 로렌쯔력을 더해줌으로써 용강 순환속도를 증가시켜 환류량의 증가에 따른 탈가스효율을 항상시킬 수 있게 된다.Therefore, when gas is injected into the rising pipe of the deposition pipe of the degassing facility and the reflux of the steel is carried out by the lifting force (buoyancy) of the gas, the Lorentz force using the electromagnetic force is added to increase the molten steel circulation rate to increase the flow rate of the reflux. Gas efficiency can always be made.
다. 발명의 효과All. Effects of the Invention
이상에서 설명한 바와 같은 본 발명은 도 4 및 도 5에서 참고되는 바와 같이, 기존 대비 용강의 환류속도를 증가시키는 것으로 극저 탄소강 처리시 탈탄속도를 증가시켜 탈탄처리사간의 단축에 따른 철강제품의 생산성을 향상시키게 되는 효과가 나타나게 된다.As described above, the present invention, as described in FIGS. 4 and 5, increases the reflux rate of molten steel as compared to the existing one, and increases the decarburization rate during ultra-low carbon steel treatment, thereby reducing the productivity of steel products according to the shortage between decarburization yarns. The effect will be improved.
특히 본 발명에 따른 용강의 환류속도의 조절은 전자기력 발생장치에 의한 로렌쯔력의 크기에 의해 결정되는데, 이 로렌쯔력은 전류크기, 코일의 권선수, 주파수, 코어 및 코일의 형상 등에 기인하게 되므로 이들 중 어느 하나 이상의 요소를 조정하는 것으로 최적의 가속 환류속도를 얻을 수 있다.In particular, the control of the reflux speed of the molten steel according to the present invention is determined by the magnitude of the Lorentz force by the electromagnetic force generating device, and the Lorentz force is due to the current size, the number of turns of the coil, the frequency, the core and the shape of the coil. By adjusting any one or more of these elements, an optimum accelerated reflux rate can be obtained.
제1도는 일반적인 용강환류장치를 설명하기 위한 개략도이다.1 is a schematic diagram for explaining a general molten steel reflux apparatus.
제2도는 본 발명에 따른 용강가속 환류장치의 개념 설명도이다.2 is a conceptual explanatory diagram of the molten steel acceleration reflux apparatus according to the present invention.
제3도의 (a)(b)는 본 발명에 따른 용강가속 환류장치의 수직단면 구조도 및 그의 A-A'선 수평단면 구조도이다.(A) (b) of FIG. 3 is a vertical cross-sectional structural diagram of the molten steel acceleration reflux apparatus according to the present invention, and A-A 'line horizontal cross-sectional structural diagram thereof.
제4도는 본 발명의 장치에서의 용강환류 속도와 종래의 장치에서의 용강환류 속도의 측정치 비교 그래프이다.4 is a graph comparing the measured values of the molten steel reflux rate in the apparatus of the present invention with the molten steel reflux rate in the conventional apparatus.
제5도는 본 발명 장치에서의 탈탄계수와 종래의 장치에서의 탈탄계수의 측정치 비교 그래프이다.5 is a graph comparing the measured values of the decarburization coefficient in the apparatus of the present invention with the decarburization coefficient in the conventional apparatus.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
2 : 상승관 3 : 하강관2: ascending pipe 3: descending pipe
4 : 용강 5 : 래들4: molten steel 5: ladle
6 : 가스주입구 8 : 가스기포6: gas inlet 8: gas bubble
9 : 베셀 10 : 전자기력 발생장치9: vessel 10: electromagnetic force generator
11 : 코어 12 : 코일11: core 12: coil
가. 발명의 목적end. Purpose of the Invention
1) 발명이 속하는 기술분야 및 그 분야의 종래기술1) the technical field to which the invention belongs and the prior art in that field
본 발명은 제강공정중의 2차정련 설비인 진공 탈가스장치(고)의 베셀내부를 진공상태로 만들고 환류가스(Ar)를 취입함으로써 용강을 강제환류시켜 용강 중에 포함되어 있는 N, H, O 등의 가스성분을 제거할 수 있도록 한 전자기력을 이용한 진공 탈가스장치의 용강가속 환류장치에 관한 것이다.According to the present invention, the inside of the vessel of the vacuum degassing apparatus (high), which is a secondary refining facility during the steelmaking process, is made into a vacuum state and forced reflux of molten steel by injecting reflux gas (Ar) to be contained in the molten steel. It relates to a molten steel accelerated reflux device of a vacuum degassing apparatus using an electromagnetic force to remove such gas components.
진공 탈가스 설비는 도 1에서 보이고 있는 바와 같이, 베셀(9)의 내부를 진공상태로 만들고 여기에 환류가스를 취입함으로써 용강을 강제환류시켜 용강 중에 포함된 N, H, O 등의 가스 성분을 제거하기 위한 설비이다.As shown in FIG. 1, the vacuum degassing equipment makes the interior of the vessel 9 in a vacuum state and blows the reflux gas into the reflux gas, thereby forcibly refluxing the molten steel to remove gas components such as N, H, and O contained in the molten steel. It is a facility for removing.
이러한 탈가스 설비에서 상기 베셀(9)은 상승관(2)과 하강관(3)을 가진다. 상승관(2)은 래들(5)내의 용강을 베셀내부로 이동하는 관으로써 가스 주입구(6)가 마련되고 있다. 하강관(3)은 베셀내의 용강을 래들(5)로 하강시키는 관이다.In this degassing facility the vessel 9 has a riser 2 and a downcomer 3. The riser 2 is a tube for moving the molten steel in the ladle 5 to the inside of the vessel, and a gas injection port 6 is provided. The downcomer 3 is a tube for lowering the molten steel in the vessel to the ladle 5.
용강이 진공 탈가스 설비에 도달할 때 용강중에는 불순원소와 개재물이 존재하게 되는데 진공상태에서는 용강중 C+C=CO 반응(탈탄반응)이 촉진되어 카본의 제거가 용이하고, 또한 용강의 강제환류는 용강중에 존재하는 비금속 개재물의 부상분리를 유도하기 때문에 용강의 2차 정련설비로써 상기 진공 탈가스 장치가 많이 사용되고 있다.When molten steel reaches the vacuum degassing facility, impurity elements and inclusions are present in the molten steel.In the vacuum state, the C + C = CO reaction (decarburization reaction) is promoted in the molten steel to facilitate the removal of carbon. In order to induce floating separation of nonmetallic inclusions present in molten steel, the vacuum degassing apparatus is widely used as a secondary refining equipment for molten steel.
이러한 탈가스 설비를 이용한 정련효율은 용강의 환류속도가 빠를수록 유리하므로 용강의 환류속도를 증가시키기 위한 기술의 개발에 많은 노력이 경주되고 있다.Since the refining efficiency using such a degassing facility is advantageous as the reflux speed of molten steel is faster, much efforts are being made to develop a technology for increasing the reflux rate of molten steel.
지금까지는 연주 몰드공정에서 침지 노즐에서 토출되는 용강의 유속을 억제하기 위해 직류에 의한 전자기력을 이용하여 왔으며, 래들내의 용강을 교반하기 위해서는 교류에 의한 전자기력을 이용하고 있다.Up to now, the electromagnetic force by direct current has been used to suppress the flow velocity of the molten steel discharged from the immersion nozzle in the casting mold process, and the electromagnetic force by alternating current is used to stir the molten steel in the ladle.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940036421A KR970007154B1 (en) | 1994-12-23 | 1994-12-23 | Back flow method of molten metal with vaccum degasification device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940036421A KR970007154B1 (en) | 1994-12-23 | 1994-12-23 | Back flow method of molten metal with vaccum degasification device |
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| Publication Number | Publication Date |
|---|---|
| KR960023127A KR960023127A (en) | 1996-07-18 |
| KR970007154B1 true KR970007154B1 (en) | 1997-05-03 |
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| KR1019940036421A KR970007154B1 (en) | 1994-12-23 | 1994-12-23 | Back flow method of molten metal with vaccum degasification device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100388235B1 (en) * | 1998-12-14 | 2003-10-30 | 주식회사 포스코 | Molten steel refinery equipped with molten metal heating and reflux means by AC electromagnetic field |
-
1994
- 1994-12-23 KR KR1019940036421A patent/KR970007154B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100388235B1 (en) * | 1998-12-14 | 2003-10-30 | 주식회사 포스코 | Molten steel refinery equipped with molten metal heating and reflux means by AC electromagnetic field |
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| Publication number | Publication date |
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| KR960023127A (en) | 1996-07-18 |
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