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A kind of rh pre-evacuation device and method

A pre-evacuation and vacuum chamber technology, applied in the field of RH pre-evacuation devices, can solve the problems of inability to have a vacuum degree and difficulty in opening the main valve, and achieve the effect of improving the RH efficiency and reducing the difficulty of opening.

Active Publication Date: 2022-07-19
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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  • A kind of rh pre-evacuation device and method
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  • A kind of rh pre-evacuation device and method

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Embodiment 1

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

[0039] Among them, the RH mentioned in the present invention refers to the molten steel vacuum circulation refining method. The RH front 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 ...

Embodiment 2

[0046] In the second aspect, the present invention also provides a RH pre-evacuation method, such as image 3As shown, close the main valve 3 and open the side valve 5 before RH 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, wait for the molten steel to be processed. Then the ladle 7 is lifted to the position of the dip tube 6, the dip tube 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 dip tube 6 under the action of atmospheric pressure for RH. After the RH is over, close the main valve 3, and perform vacuum breaking treatment on the vacuum chamber 1 on one side of the main valv...

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 bypass pipeline 4 is set to 250mm. When the vacuum degree of the main line 2 reaches 0.02MPa, the side valve 5 is opened. Continue to pre-evacuate the vacuum chamber 1 through the bypass pipeline 4. When the vacuum degree of the vacuum chamber 1 reaches 0.05MPa, close the side valve 5 and prepare to vacuum the molten steel in the ladle 7. In the whole pre-evacuation process, it is measured that the time for the existing RH vacuum chamber 1 to reach a deep vacuum is 5 minutes, and the time for the RH vacuum chamber 1 of the present invention to reach a deep vacuum is 3.5 minutes.

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Abstract

The invention discloses a RH pre-evacuating device and method, relates to the technical field of out-of-furnace refining, and solves the technical problems that the existing vacuum chamber cannot have a vacuum degree before RH and the main valve is difficult to open. The device includes a vacuum chamber, a main pipeline and a bypass pipeline. The vacuum chamber is connected with an immersion pipe. The main pipeline is connected between the vacuum system and the vacuum chamber. The main pipeline is provided with a main valve, and the two ends of the bypass pipeline are respectively connected to the main valve. The main pipelines on both sides are connected, the bypass pipeline is provided with a bypass valve, and the immersion pipe is connected with a blocking device. The invention adds a bypass pipeline and a bypass valve on the main pipeline, and seals the immersion pipe through a blocking device, so that the vacuum chamber can be pre-evacuated through the bypass pipeline, so that the vacuum chamber has a vacuum degree before RH. At the same time, in the RH process, since both sides of the main valve have a degree of vacuum, the difficulty of opening the main valve is also reduced, and the RH efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of out-of-furnace refining, in particular to a RH pre-evacuating device and method. Background technique [0002] RH refining is the liquid steel vacuum cycle degassing method, through the pre-vacuum technology, the molten steel is decarburized, deoxidized, degassed, and impurity removed in a vacuum chamber. The specific steps are: before the molten steel is processed, close the main valve of the vacuum pumping pipeline, pre-evacuate the pumping pipeline, and wait for the molten steel to contact the vacuum chamber, then open the main valve to make the vacuum chamber pass through the pumping pipeline. , 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, even if there is a low degree of vacuum in the air extraction pipeline, the vacuum chamber is still in a state of normal pressure. First of all, due to the pressu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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