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A rh vacuum powder spraying refining device and powder spraying method thereof

A refining device and powder spraying technology, applied in the field of refining outside the molten steel furnace, can solve the problems of high operation difficulty, maintenance difficulty and short service life of the spray gun, and achieve the improvement of powder spraying effect, powder spraying efficiency and purity. Effect

Active Publication Date: 2021-08-03
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a RH vacuum powder spraying refining device and its powder spraying method, which overcomes the problems of high difficulty in spray gun operation, short service life, serious splashing, easy blockage of the nozzle, and relatively difficult maintenance.

Method used

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  • A rh vacuum powder spraying refining device and powder spraying method thereof
  • A rh vacuum powder spraying refining device and powder spraying method thereof
  • A rh vacuum powder spraying refining device and powder spraying method thereof

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Experimental program
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Effect test

Embodiment 1

[0051] Such as Figure 5-7 As shown, the present invention is used for vacuum refining and powder spraying desulfurization of molten steel, and the device includes: a vacuum chamber 1, a ladle 3, a powder spraying element 5, a buffer gas chamber 7, a quick connection part 8, a rising pipe 21, a descending pipe 22, and a lifting gas pipeline 4 etc.

[0052] The inner diameter of the RH dipping tube is 550m, and the inner diameter of the vacuum chamber is 1860mm. The powder spraying element is in the form of a steel pipe, built into the bottom of the vacuum chamber, see Figure 5 , the quantity is 2 pieces. The arrangement position is close to the upper and lower sides of the vacuum chamber near the rising legs. The molten steel near the upper opening of the riser is violently tumbling, and the arrangement near this area can make the desulfurization powder fully contact and react with the molten steel, and also prolong the residence time of the powder in the vacuum chamber to...

Embodiment 2

[0066] Such as Figure 8-9 As shown, the vacuum refining powder spraying desulfurization device for molten steel of the present invention comprises: a vacuum chamber 1, a ladle 3, a powder spraying element 5, a buffer gas chamber 7, a quick connection part 8, a rising pipe 21, a descending pipe 22, a lifting gas pipeline 4, etc. .

[0067] The inner diameter of the RH dipping tube is 550m, and the inner diameter of the vacuum chamber is 1860mm. The powder spraying element is in the form of a steel pipe, built into the bottom of the vacuum chamber, see Figure 8 , the quantity is 4 pieces. The vertical inclination angle of the nozzle is 20 degrees, see Figure 9 . In the figure, the nozzles all point to the upper center of the rising leg, and the horizontal angles between the nozzles and the center line of the lifting pipe are 15 degrees and 50 degrees respectively.

[0068] The four nozzles are evenly arranged in the steel flow moving from the riser to the downcomer, and ...

Embodiment 3

[0081] Such as Figure 10-11 As shown, the molten steel vacuum refining alloy powder spraying device of the present invention comprises: a vacuum chamber 1, a ladle 3, a powder spraying element 5, a buffer gas chamber 7, a quick connection part 8, a rising pipe 21, a descending pipe 22, and a lifting gas pipeline 4 Wait.

[0082] The inner diameter of the RH dipping tube is 550m, and the inner diameter of the vacuum chamber is 1860mm. The powder spraying element is in the form of a steel pipe, built into the bottom of the vacuum chamber, see Figure 10 , the quantity is 2 pieces. The vertical inclination angle of the nozzle is 15 degrees, see Figure 9 . Both tend to descend toward the center of the leg.

[0083] After the alloy powder is sprayed through the nozzle, it is rapidly melted in the molten steel, and quickly participates in the circulation flow with the molten steel to complete the homogenization of the alloy composition as soon as possible. The inner diameter...

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Abstract

An RH vacuum powder spraying refining device and a powder spraying method thereof belong to the technical field of molten steel refining outside the furnace. The RH vacuum refining powder spraying device includes a vacuum molten steel circulation device and a powder spraying device. Among them, the vacuum molten steel circulation device includes a vacuum chamber, a dipping pipe, a ladle, and a lifting gas pipeline. The powder spraying device includes a powder spraying element, a powder supply pipe, a buffer air chamber, and quick-connect parts. Powder spraying methods include but are not limited to refining and alloying functions such as desulfurization, deoxidation, removal of inclusions, and addition of alloys. The advantage is that the bottom of the vacuum tank is improved on the basis of the RH conventional structure, and the installation parameters of the nozzle can be adjusted to meet the process needs of different steel types; it is easy to implement and maintain, can improve production efficiency and save production costs, and has great advantages Good application prospects.

Description

technical field [0001] The invention belongs to the technical field of molten steel refining outside the furnace, and in particular relates to an RH vacuum powder spraying refining device and a powder spraying method thereof. Background technique [0002] The RH refining technology jointly developed by Rheinstahl and Hutlenwerke in Germany effectively combines the vacuum refining technology with the circulating flow technology of molten steel. RH technology has a series of advantages such as short processing cycle, good process effect, and high purity of molten steel. It has become an important out-of-furnace refining technology and is widely used in steelmaking plants with fast pace and large production capacity. With the development of technology, RH refining equipment can achieve various refining purposes such as degassing, decarburization, desulfurization, removal of oxygen and inclusions, uniform temperature and composition, etc. The factory is also equipped and applie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C7/04C21C7/10
CPCC21C7/0037C21C7/04C21C7/10
Inventor 贺庆李相臣姚同路倪冰林腾昌
Owner CENT IRON & STEEL RES INST
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