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RH pre-vacuumizing device and method

A pre-vacuumization and vacuum chamber technology, applied in the field of RH pre-vacuumization device, can solve problems such as lack of vacuum degree and difficulty in opening the main valve, and achieve the effect of improving RH efficiency and reducing the difficulty of opening

Active Publication Date: 2021-04-06
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to overcome the deficiencies of the prior art. In the first aspect, a RH pre-vacuumizing device is provided to solve the technical problem that the existing vacuum chamber cannot have a vacuum degree before RH and the main valve is difficult to open

Method used

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  • RH pre-vacuumizing device and method

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Effect test

Embodiment 1

[0038] In the prior art, before the RH, the main valve is closed first, and the vacuum system is used to pre-evacuate the pumping pipeline so that the pumping pipeline has a certain degree of vacuum. During the RH process, the main valve is opened, the vacuum chamber gradually forms a vacuum through the pumping pipeline, and then the molten steel is subjected to RH. Since the main valve is in low vacuum on one side of the vacuum system and in a normal pressure state on the other side of the vacuum chamber, it is difficult to open the main valve. In addition, during the entire vacuum process, the vacuumization speed of the vacuum chamber 1 is slow.

[0039] Wherein, the RH mentioned in the present invention refers to the molten steel vacuum circulation refining method. The pre-RH mentioned in the present invention refers to the time when the vacuum chamber is not in contact with the molten steel, and at this time, the vacuum system is used to pre-evacuate the pumping pipeline....

Embodiment 2

[0046] In the second aspect, the present invention also provides a RH pre-vacuumizing method, such as image 3As shown, before the RH, close the main valve 3 and open the side valve 5 to start the vacuum system. Since the dip tube 6 has been blocked by the blocking device, the vacuum system pre-evacuates the vacuum chamber 1 through the bypass line 4 . When the vacuum degree of the vacuum chamber 1 reaches the first set value, the molten steel is waiting to be processed. Then the ladle 7 is lifted to the position of the dipping pipe 6, the dipping pipe 6 is immersed in the molten steel of the ladle 7, the main valve 3 is opened and the side valve 5 is closed. The blocking plate 61 and the sealing member 64 dissolve into the molten steel, and the molten steel enters the vacuum chamber 1 through the dipping tube 6 under the action of atmospheric pressure for RH. After the RH is finished, close the main valve 3, and carry out vacuum breaking treatment on the vacuum chamber 1 on...

Embodiment 3

[0051] A 210t RH vacuum chamber 1 is selected, the diameter of the main pipeline 2 is set to 1500mm, and the diameter of the side pipeline 4 is set to 250mm. When the vacuum degree of the main pipeline 2 reaches 0.02MPa, the side valve 5 is opened. Continue to pre-evacuate the vacuum chamber 1 through the bypass pipeline 4, and when the vacuum degree of the vacuum chamber 1 reaches 0.05 MPa, close the bypass valve 5, and prepare to carry out vacuum treatment to the molten steel in the ladle 7. The whole pre-evacuation process is measured: the time for the existing RH vacuum chamber 1 to reach the deep vacuum is 5 minutes, and the time for the RH vacuum chamber 1 of the present invention to reach the deep vacuum is 3.5 minutes.

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Abstract

The invention discloses an RH pre-vacuumizing device and method, relates to the technical field of external refining, and solves the technical problems that a vacuum chamber in the prior art cannot have the vacuum degree before RH and a main valve is difficult to open. The device comprises a vacuum chamber, a main pipeline and a bypass pipeline, the vacuum chamber is connected with a dip pipe, the main pipeline is communicated between a vacuum system and the vacuum chamber, a main valve is arranged in the main pipeline, two ends of the bypass pipeline are respectively communicated with the main pipeline on two sides of the main valve, a bypass valve is arranged in the bypass pipeline, and the dip pipe is connected with a plugging device. By additionally arranging the bypass pipeline and the bypass valve on the main pipeline and sealing the dip pipe through the plugging device, the vacuum chamber can be pre-vacuumized through the bypass pipeline, and therefore the vacuum chamber has the vacuum degree before RH. Meanwhile, in the RH process, due to the fact that the two sides of the main valve have the vacuum degree, the opening difficulty of the main valve is lowered, and the RH efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of refining outside the furnace, in particular to a RH pre-vacuumizing device and method. Background technique [0002] RH refining is the vacuum circulation degassing method of molten steel. Through the pre-vacuum technology, the molten steel is subjected to decarburization, deoxidation, degassing, and impurity removal in a vacuum chamber. The specific steps are: before the molten steel is processed, close the main valve of the vacuum pumping line, pre-evacuate the pumping line first, and wait for the molten steel to contact the vacuum chamber, open the main valve to make the vacuum chamber quickly vacuum through the pumping line. , so as to realize the RH treatment of molten steel in the vacuum chamber. [0003] In the prior art, due to the large volume of the vacuum chamber, the vacuum chamber is still in a state of normal pressure even though the vacuum degree in the pumping pipeline is relatively low. ...

Claims

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Application Information

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IPC IPC(8): C21C7/10
CPCC21C7/10
Inventor 刘道正高攀樊书芳陈建光黄福祥刘风刚龚坚
Owner BEIJING SHOUGANG CO LTD
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