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Anti-blocking device for blow hole of dip tube of RH furnace and method for removing steel slag from blow hole

A technology of blowing holes and dipping tubes, which is applied in the field of iron and steel metallurgy and steelmaking, which can solve the problems of high cost and long reaction time, and achieve the effects of low cost, short processing time and strong operability

Pending Publication Date: 2021-06-01
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned technical solution is mainly to remove the cold steel in the vacuum tank, and use the aluminum-oxygen reaction to heat and the oxygen lance to heat and remove the cold steel. It is long and can only melt and remove the hanging slag at the end of the circulation pipe, and has no effect on removing the deep clogged steel slag inside the circulation pipe (that is, the blowing hole)

Method used

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  • Anti-blocking device for blow hole of dip tube of RH furnace and method for removing steel slag from blow hole
  • Anti-blocking device for blow hole of dip tube of RH furnace and method for removing steel slag from blow hole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, an anti-blocking device for the blowing hole of the RH furnace dipping tube, including a vacuum tank 1, a dipping tube riser 2, a dipping tube downcomer 3, a blowing hole 4, a nitrogen branch pipe 5, an argon branch pipe 6 and a blowing pipe 7. The bottom of the vacuum tank 1 is provided with a dipping pipe ascending pipe 2 and a dipping pipe descending pipe 3. The lower end of the dipping pipe ascending pipe 2 is provided with a blowing hole 4, and the blowing hole 4 is connected with a blowing pipe 7. Pipeline 7 is connected with a nitrogen sub-pipeline 5 and an argon sub-pipeline 6 from the far-end side of the dipping tube riser 2, and the device also includes an oxygen sub-pipeline 8 and a flow meter 9. The proximal side of 2 is provided with an oxygen sub-pipeline 8 and a flow meter 9 sequentially from left to right.

[0029] The nitrogen sub-pipeline 5, the argon sub-pipeline 6 and the oxygen sub-pipeline 8 are respectively provided wit...

Embodiment 2

[0033] Utilize the anti-clogging device of the RH furnace dipping tube air blowing hole in Example 1 to implement the method of removing the blowing hole steel slag. After the RH furnace smelting is completed, the vacuum tank 1 is repressurized, the operator lowers the ladle, and the blowing hole 4 of the dipping tube ascending pipe 2 is interlocked automatically. Switch from argon to nitrogen protection.

[0034] 1) The pressure of the pressure transmitter corresponding to the nitrogen main pipeline is 1mpa and the initial flow rate of the nitrogen branch pipeline 5 is 85m3 / h. When one of the blowing holes 4 is blocked, the flow value measured by the flow meter 9 is higher than that of the blowing hole 4. The corresponding value of information collection during blockage is reduced by 20%, the pressure value of the pressure transmitter of the oxygen main pipeline is 1.0mpa, and the flow control valve of the corresponding oxygen sub-pipeline 8 is controlled to be opened, and the...

Embodiment 3

[0037] Different from Example 2, when multiple blowing holes 4 are blocked, due to the different degrees of blockage, the change of the required initial oxygen flow rate needs to be considered.

[0038] 1) The pressure of the pressure transmitter corresponding to the nitrogen main pipeline is 1mpa and the initial flow rate of the nitrogen branch pipeline 5 is 85m3 / h. When two of the blowing holes 4 are blocked, the flow value measured by a flowmeter 9 is higher than that of the unblocked one. The corresponding value of information collection is reduced by 25%, and the flow value measured by another flowmeter 9 is 80% lower than the corresponding value of information collection when the blowing hole 4 is not blocked. The pressure value of the pressure transmitter of the oxygen main pipeline is 1.0mpa, and the control is opened The flow control valve of the corresponding oxygen sub-pipeline 8 respectively closes the flow control valve of the nitrogen sub-pipeline 5 after 30 secon...

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Abstract

The invention belongs to the field of ferrous metallurgy steelmaking, and particularly relates to an anti-blocking device for a blow hole of a dip tube of a RH furnace and a method for removing steel slag from the blow hole. By arranging an oxygen branch pipeline and a flow meter on a blow pipeline, when the blow hole in an ascending tube of the dip tube becomes smaller or is completely blocked, oxygen gas is introduced when a vacuum tank is not treated, and oxygen gas and the steel slag in the blow hole of the ascending tube of the dip pipe are subjected to oxidation reaction, so that the blocked steel slat at the blow hole of the ascending tube of the dip tube is melted, and the steel slag or molten steel is blown out of the blow hole by virtue of oxygen gas at a certain flow speed. The cleaning process is safe and efficient, is more efficient than additional reactants, is short in treatment time and lower in cost, and particularly can be used for effectively removing steel slag which is deeply blocked in the blow hole. The anti-blocking device can effectively reduce a condition that flow of the blow hole is reduced or the blow hole is completely blocked, so that the circulation effect in the service life of the dip tube is ensured, and the dip tube is prevented from being off line due to blockage.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and steelmaking, and in particular relates to an anti-blocking device for an air blowing hole of an RH furnace dip tube and a method for removing steel slag from the air blowing hole. Background technique [0002] The circulation flow rate of the RH furnace can most directly reflect the refining efficiency of the RH. The increase of circulation flow can improve the processing capacity of RH, enhance the uniformity and purity of molten steel components, thereby improving and stabilizing the quality of molten steel. The size and flow rate of the blowing hole of the dipping tube are the most direct and dynamic key factors affecting the circulation flow, so the blowing hole of the dipping tube has become an important part of the vacuum refining furnace technicians' attention; because a large amount of molten steel and steel slag are impregnated The blowing hole is blocked by the flow of the a...

Claims

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Application Information

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IPC IPC(8): C21C7/10C21C7/072
CPCC21C7/10C21C7/072Y02P10/20
Inventor 邹春锋韩蕾蕾李四军李萍湖滨杜金科石红燕付常伟
Owner SHANDONG IRON & STEEL CO LTD
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