KR900006688Y1 - Vacuum degasing device for molten steel - Google Patents
Vacuum degasing device for molten steel Download PDFInfo
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- KR900006688Y1 KR900006688Y1 KR2019870023276U KR870023276U KR900006688Y1 KR 900006688 Y1 KR900006688 Y1 KR 900006688Y1 KR 2019870023276 U KR2019870023276 U KR 2019870023276U KR 870023276 U KR870023276 U KR 870023276U KR 900006688 Y1 KR900006688 Y1 KR 900006688Y1
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- molten steel
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- reflux
- ladle
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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
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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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
내용 없음.No content.
Description
제1도는 종래의 진공탈가스장치의 사용상태도.1 is a state diagram used in the conventional vacuum degassing apparatus.
제2도는 본 고안의 진공탈가스장치의 사용상태도.2 is a state of use of the vacuum degassing apparatus of the present invention.
제3도는 환류가스유량에 따른 환류량의 관계를 나타내는 그래프.3 is a graph showing the relationship between the reflux amount and the reflux gas flow rate.
제4도는 진공 탈가스시 래들내 유동현상을 나타내는 사진.Figure 4 is a photograph showing the flow phenomenon in the ladle when vacuum degassing.
제5도는 경사각이 tan-1(d/L)보다 작은 경우의 래들내 유동현상을 나타내는 사진.5 is a photograph showing the flow phenomenon in the ladle when the inclination angle is smaller than tan −1 (d / L).
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 진공조 2 : 래들1: vacuum chamber 2: ladle
3 : 상승관 4 : 지금3: riser 4: now
5 : 용강 9 : 가스관5: molten steel 9: gas pipe
12 : 하강관12: down pipe
본 고안은 제강공장의 진공탈가스장치에 관한 것이다.The present invention relates to a vacuum degassing apparatus of a steelmaking factory.
종래의 진공탈가스장치는 제1도에 도시된 바와같이, 상승관(3)이 진공조(1)의 벽에 근접하여 있기 때문에 환류가스가 상승관(3) 내부로 취입된 후에 용간내에서 발생되는 환류가스기포(8)에 의해 진공조(1)내의 용강계면(6)에서는 용강비산이 일어나게되고, 비산된 용강(7)은 근접해 있는 진공조의 내측벽에 쉽게 부착되어 지금(4)을 형성하게 된다. 지금이 형성되면 본 장치내에서 타강종에대하여 탈가스처리를 할 때 지금이 용강에 의해 재용해되어 용강의 성분조정을 매우 어렵게 하고 지금을 주기적으로 제거해야 하기 때문에 설비가동율을 저하시키는 문제점이 있는 것이다.In the conventional vacuum degassing apparatus, as shown in FIG. 1, since the riser tube 3 is close to the wall of the vacuum chamber 1, the reflux gas is blown into the riser tube 3 in the molten metal. The generated reflux gas bubble 8 causes molten steel scattering to occur at the molten steel interface 6 in the vacuum chamber 1, and the molten steel 7 scattered easily adheres to the inner wall of the adjacent vacuum chamber and is now attached to the inner wall 4. To form. When the current is formed, when degassing the other steel species in this device, it is redissolved by the molten steel, making it difficult to adjust the composition of the molten steel and removing the current periodically. will be.
한편 진공탈가스처리시 하강관(12)을 통고하여 래들(2)로 유입되는 용강유량인 환류량과 탈탄 방응효율과의 관계식은 다음과 같다.On the other hand, the relationship between the reflux flow rate and the decarburization response efficiency, which is the molten steel flow rate flowing into the ladle 2 through the down pipe 12 during vacuum degassing treatment is as follows.
(N. Sumida et al. 川埼製鐵技報 15(1983), 9152)(N. Sumida et al. 15, 1983, 9152)
Cl=Cl0·EXP(-K·t) (1) Cl = Cl 0 · EXP (-K · t) (1)
K=Q/V·ak/(Q+ak) 단, Cl0: 래들(2)내 초기탄소농도, Cl : 시간 t에서 래들내 탄소농도, t : 처리시간, k : 반응정수, Q : 환류량, ak : 탈탄반응용량계수, V : 래들내용강총부피 상기식(1)에서 알 수 있듯이 환류량은 반응효율에 매우 영향이 큰 인자로서 환류량이 증가할수록 반용효율은 향상되고 처리시간은 단축된다.K = Q / V · ak / (Q + ak) where Cl 0 : initial carbon concentration in ladle (2), Cl: carbon concentration in ladle at time t, t: treatment time, k: reaction constant, Q: reflux Volume, ak: decarburization capacity coefficient, V: ladle contents of steel gross volume As can be seen from Equation (1), the reflux amount is a factor that greatly affects the reaction efficiency. .
또한 환류량과 조업변수와의 관계는 다음식 (2)와 같다.In addition, the relationship between the reflux and the operating variable is shown in the following equation (2).
(H. Watanabe et al : 鐵と鋼, 54(1968) p. 3)(H. Watanabe et al., 鐵 と 鋼, 54 (1968) p. 3)
Q=K1·D×1.5·Qg×033 여기서 K1 : 상수, D : 침적관직경, Qg : 환류가스유량 즉, 상기식(2)에서 알 수 있듯이 환류량을 증대시키기 위해서는 침적관의 직경을 확대하고, 환류가스 유량을 크게해야 하는 것이다. 상기식(1) 및 (2)에서 본다면 종래의 진공탈가스장치는 상승관(3)과 하강관(12)이 각 1개씩이므로 환류량을 증대시키는 데에는 구조적인 한계가 있는 것이다.Q = K1 · D × 1.5 · Qg × 033 where K1: constant, D: diameter of the deposition tube, Qg: reflux gas flow rate, that is, as shown in Equation (2), the diameter of the deposition tube is increased to increase the reflux amount. The flow rate of the reflux gas must be increased. In the equations (1) and (2), the conventional vacuum degassing apparatus has a structural limitation in increasing the reflux amount because each of the uppipe 3 and the downpipe 12 is one each.
따라서 본 발명의 목적은 진공조내 지금부착을 구조적으로 방지하고, 환류량을 증대시킨 용강의 진공탈가스장치를 제공하는데 있다.It is therefore an object of the present invention to provide a vacuum degassing apparatus of molten steel that structurally prevents adhesion of the now in the vacuum chamber and increases the reflux amount.
이하 본 고안의 구성을 도면에 의거 설명한다.Hereinafter, the configuration of the present invention will be described with reference to the drawings.
본 고안의 장치는 제2도에 도시된 바와같이, 진공조(1)의 저면 중앙에 상승관(3)을 구성하고 진공조(1)의 약 측면하단 가까이에 2개의 하강관(12)를 각각 구성하며, 상기 하강관은 수직선과 θ의 각을 이루며 외측으로 향하게 한 것이다.The apparatus of the present invention, as shown in FIG. 2, constitutes a riser tube 3 in the center of the bottom surface of the vacuum chamber 1, and the two downcomers 12 near the lower side of the side of the vacuum chamber 1 Each of the downcomers is configured so as to face outward in an angle of θ with a vertical line.
경사각 θ의 범위는 θ>tan-1(d/L)로 한다.The range of the inclination angle θ is set to θ> tan −1 (d / L).
상기와 같이 구성된 본 고안의 장치는 상승관(3)의 진공조(1)의 중앙에 위치하기 때문에 환류가스기포(8)에 의해서 비산되는 용강의 비산영역이 진공조(1)내 공간으로 한정되어 비산된 용강이 진공조벽에 도달하지 못하고 다시 진공조(1)내의 용강(5)으로 떨어져서 진공조벽에 부착되는 지금량이 대폭 감소되는 것이다.Since the apparatus of the present invention configured as described above is located at the center of the vacuum chamber 1 of the rising pipe 3, the scattering region of the molten steel scattered by the reflux gas bubble 8 is limited to the space in the vacuum chamber 1. The molten steel that has been scattered does not reach the vacuum chamber wall but falls back to the molten steel 5 in the vacuum chamber 1, and the amount of current attached to the vacuum chamber wall is greatly reduced.
또한 진공탈가스시 하강관(12)을 2개 구성함으로써 래들(2)로부터 진공조(1)내로 유입된 용강이 2개의 하강관을 통하여 래들(2)로 유출되어 종래의 1개의 하강관을 갖는 진공탈가스장치보다 환류량이 증가하는 것이다.In addition, when the vacuum degassing comprises two down pipes 12, the molten steel flowing from the ladle 2 into the vacuum tank 1 flows out to the ladle 2 through the two down pipes, thereby providing one conventional down pipe. The reflux amount is increased more than the vacuum degassing apparatus having.
이하 본 고안을 실시예에 의해 설명한다.Hereinafter, the present invention will be described by way of examples.
본 고안의 장치에 대한 환류량의 증대효과를 정량적으로 측정하기 위하여 축소 수모텔장치를 이용하여 시험하였다.In order to quantitatively measure the effect of increasing the reflux amount on the device of the present invention, it was tested using a reduced number motel device.
1/5크기의 축소수 모델 RH진공탈가스장치를 이용하여 하기표 1의 조건에 의해 환류량증가효과를 측정하였다.A 1/5 size reduction water model RH vacuum degassing apparatus was used to measure the reflux increase effect under the conditions shown in Table 1 below.
[표 1]TABLE 1
상기 비교예 1은 본 고안과 같은 침적관 직경을 갖는 것이며 비교예 2는 본 고안과 거의 같은 침적관 총단면적을 갖는 것이다.Comparative Example 1 has the same diameter as the present invention, and Comparative Example 2 has a total cross-sectional area of the same as the present invention.
수모델 실험에서 피크면적법(Peakarea method)(K. Nakanish, et al : Ironmaking ＆ Steel meking, (1975) p 115)을 이용하여 측정한 환류량을 비교하여 제3도에 도시하였다.The reflux measured by the Peakakarea method (K. Nakanish, et al: Ironmaking & Steel meking, (1975) p 115) in a water model experiment is shown in FIG.
제3도에 의하면 본 고안에 의한 환류량은 비교예 1보다 침적관의 단면적이커서 환류량이 증가하며, 한편 같은 침적관 총단면적을 갖는 본 고안과 비교예 2를 비교하면 본 고안의 환류량이 크게 나타나는 바 이는 본 고안이 비교예 2보다 하강관 단면적이 크게 구성되어 있어 상승관(3)을 통해서 진공조(1)로 유입된 용강(5)이 보다 넓은 하강관(12)을 통해 용이하게 래들(2)로 유출되기 때문이다.According to FIG. 3, the reflux amount of the present invention has a larger cross-sectional area of the immersion tube than that of Comparative Example 1, while the reflux amount of the present invention is larger than that of the present invention and Comparative Example 2 having the same total sectional area of the immersion tube. It appears that the present invention has a larger down pipe cross section than Comparative Example 2, the molten steel (5) introduced into the vacuum chamber (1) through the rising pipe (3) is easily ladle through the wide down pipe (12) It is because it flows into (2).
따라서 본 고안의 진공탈가스장치는 종래의 탈가스 장치보다 환류량이 증가하여 실제용강에 의한 탈가스조업시 야금반응효율을 크게 증가시키는 것이다.Therefore, the vacuum degassing apparatus of the present invention is to increase the reflux amount than the conventional degassing apparatus to greatly increase the metallurgical reaction efficiency during the degassing operation by the actual molten steel.
한편, 제4도는 탈가스처리 종래와 본 고안의 래들(2)내 유동현상을 비교한 사진다.On the other hand, Figure 4 is a photograph comparing the flow phenomenon in the ladle (2) of the conventional degassing treatment and the present invention.
본 고안의 래들내 유동현상은 래들내 용강의 유입구인 하강관이 2개로 구성되어 있기 때문에 래들내 혼합이 종래의 장치보다 잘 일어나 야금반응효율 측면에서 유리하다.The flow phenomenon in the ladle of the present invention is advantageous in terms of metallurgical reaction efficiency because the mixing in the ladle is better than the conventional apparatus because the two downcoming pipes, which are the inlet of the molten steel in the ladle.
한편 하강관의 경사각(θ)이 tan-1(d/L)보다 작은 경우에 제5도에서 관찰할 수 있듯이 하강관을 빠져나온 유출류의 일부가 곧바로 상긍관으로 유입되는 현상이 발생하므로 야금반응효율이 저하한다.On the other hand, when the inclination angle (θ) of the downcoming pipe is smaller than tan -1 (d / L), as shown in FIG. 5, a part of the outflow stream exiting the downcoming pipe is directly introduced into the upper pipe. Reaction efficiency decreases.
따라서 경사각(θ)은 tan-1(d/L)보다 크게 한다.Therefore, the inclination angle θ is made larger than tan −1 (d / L).
상술한 바와같이 본 고안의 진공탈가스장치는 환류가스가 취입되는 상승관이 진공조 중앙에 설치하여 진공조내 용강계면에서 가스기포에 의해 비산된 용강의 진공조벽에 부착되는 것을 최소화하고, 2개의 경사진 하강관을 설치하여 용강(5)의 환류량을 증가시킴으로써 진공탈가스처리시 야금반응효율을 증대시켜 생산성 및 품질을 향상시키는 매우 효과적인 것이다.As described above, the vacuum degassing apparatus of the present invention minimizes the installation of the rising pipe into which the reflux gas is injected in the center of the vacuum chamber to be attached to the vacuum tank wall of the molten steel scattered by the gas bubbles at the molten steel interface in the vacuum chamber. By installing a sloped down pipe to increase the reflux of the molten steel (5) to increase the metallurgical reaction efficiency in the vacuum degassing process is very effective to improve the productivity and quality.
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| Application Number | Priority Date | Filing Date | Title |
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| KR2019870023276U KR900006688Y1 (en) | 1987-12-28 | 1987-12-28 | Vacuum degasing device for molten steel |
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| KR2019870023276U KR900006688Y1 (en) | 1987-12-28 | 1987-12-28 | Vacuum degasing device for molten steel |
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| KR900006688Y1 true KR900006688Y1 (en) | 1990-07-28 |
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