Bottom Blowing Argon Method with Four Hole Circulation for Rapid Mixing of Molten Steel

A bottom blowing argon and mixing technology, applied in the field of metallurgical refining outside the furnace, can solve the problems of high efficiency and high quality steel production constraints, whether argon gas can be fully used to stir molten steel, and the cleanliness of molten steel needs to be improved. The effect of shortening the mixing time of molten steel, improving the cleanliness of molten steel and smelting efficiency, and reducing the dead volume in the ladle

Active Publication Date: 2020-07-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two bottom argon blowing methods are blowing at a constant speed, the argon flow channel can be formed above the argon blowing hole, and the kinetic energy of the argon gas cannot be fully used to stir the molten steel
The two argon blowing methods both improve the uniformity and cleanliness of molten steel to a certain extent, but the blowing time is still long during the treatment process, the gas consumption is still high, and the cleanliness of molten steel still needs to be improved. The production of high-quality steel has certain constraints

Method used

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  • Bottom Blowing Argon Method with Four Hole Circulation for Rapid Mixing of Molten Steel
  • Bottom Blowing Argon Method with Four Hole Circulation for Rapid Mixing of Molten Steel
  • Bottom Blowing Argon Method with Four Hole Circulation for Rapid Mixing of Molten Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The bottom of the 110t ladle is located at a distance of 0.5R from the center of the bottom. 4 There are four argon blowing holes 5 evenly distributed, located at a distance of 0.6R from the center of the bottom. figure 1 ). The four argon blowing holes are blown in sequence sequentially, and the blowing flow rate of the sine wave peak is 8π~20πm 3 / h, the total blowing flow rate of the four argon blowing holes is 16~40m 3 / h, the cycle time is 2t. See Figure 4 . In the case of the same total flow rate of bottom blowing argon, the shortest mixing time of double-hole uniform rate bottom blowing is 69s, while the shortest mixing time of the four-hole circulating bottom blowing argon method of the present invention is 62s, and the mixing time is shortened by 10 %.

Embodiment 2

[0025] The bottom of the 110t ladle is located at a distance of 0.6R from the center of the bottom, 3 and four argon blowing holes 5 are evenly distributed, and are located at a distance of 0.6R from the center of the bottom. figure 2 ). The four argon blowing holes are blown in sequence sequentially, and the blowing flow rate of the sine wave peak is 8π~20πm 3 / h, the total blowing flow rate of the four argon blowing holes is 16~40m 3 / h, the cycle time is 4t. In a cycle period, the blowing flow changes of the four air holes are shown in Figure 4 . Under the condition that the total flow rate of bottom blowing argon is the same, the shortest mixing time of double-hole uniform rate bottom blowing is 69s, while the shortest mixing time of the four-hole circulation bottom blowing argon method of the present invention is 60s, and the mixing time is shortened by 13 %.

Embodiment 3

[0027] The bottom of the 110t ladle is located at 0.7R from the center of the bottom 2 There are four argon blowing holes 5 evenly distributed at 0.6R from the center of the bottom 3 Double holes 6 are arranged, and the angle θ between the double holes is 100° (see image 3 ). The four argon blowing holes are blown in sequence sequentially, and the blowing flow rate of the sine wave peak is 8π~20πm 3 / h, the total blowing flow rate of the four argon blowing holes is 16~40m 3 / h, the cycle time is t. In one cycle, the blowing rate of the four air holes changes as shown in Figure 4 . Under the condition that the total flow rate of bottom blowing argon is the same, the shortest mixing time of double-hole uniform rate bottom blowing is 69s, while the shortest mixing time of the four-hole circulation bottom blowing argon method of the present invention is 59s, and the mixing time is shortened by 14.5 %.

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Abstract

The invention relates to a four-hole circulating bottom argon blowing method for rapidly mixing molten steel. Four argon blowing holes are uniformly distributed in the inner diameter 0.5-0.7R positionof the bottom of a steel ladle, when steel ladle bottom blowing begins, the four argon blowing holes blow argon in sequence and in a circulating mode, the blowing flow of the argon blowing holes is changed based on the sine rule, the blowing flow range of a sine wave peak is from 8 pi to 20 pi m<3> / h, the total blowing flow of the four argon blowing holes is 16-40 m<3> / h, and the cycle time of circulating argon blowing is 1-4 t, wherein the t is the time needed by the argon from the argon blowing holes to reach the molten steel level. According to the method, an argon flow channel can be effectively prevented from being formed in the molten steel, and the kinetic energy of the argon is fully utilized to stir the molten steel; and a higher blowing rate can be generated, stirring strength is increased, the volume of dead zone in the steel ladle is further reduced, and components and temperature of the molten steel are rapidly and uniformly distributed. The method can fully use the stirring effect of the argon on the molten steel, shorten molten steel mixing time, reduce smelting cost and improve refining efficiency.

Description

technical field [0001] The invention belongs to the technical field of refining outside the metallurgical furnace, and is particularly suitable for a four-hole circulation bottom argon blowing method for quickly mixing the molten steel in a ladle and speeding up the refining process. Background technique [0002] With the social progress, the demand for high-quality clean steel is increasing year by year, and higher and stricter requirements are put forward for the production of high-quality clean steel. Refining methods for molten steel outside the furnace include slag washing, vacuum, stirring, blowing and heating. In modern metallurgical processes, these methods are usually combined. Argon blowing at the bottom of the ladle is one of the stirring methods, which has uniform molten steel temperature and composition. It can promote the floating of inclusions and improve the cleanliness of molten steel. It has the advantages of simple equipment, flexible and convenient operat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072
CPCC21C7/072
Inventor 金焱杨符董晓森林鹏程常桂孙琳井润东曹杨向宇阳潘建辉蔡强王炜
Owner WUHAN UNIV OF SCI & TECH
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