CN-224229758-U - Ladle bottom nitrogen-argon blowing anti-cross-gas switching device and ladle furnace

Abstract

The utility model provides a ladle bottom nitrogen-argon blowing anti-cross-gas switching device and a ladle furnace, wherein the anti-cross-gas switching device comprises an argon branch and a nitrogen branch which are connected in parallel; the device comprises a first argon gas control valve, a second argon gas control valve, a first nitrogen gas control valve and a second nitrogen gas control valve, wherein a first exhaust branch is communicated between the first argon gas control valve and the second argon gas control valve, and the first exhaust control valve is arranged between the first argon gas control valve and the second argon gas control valve, and a second exhaust branch is communicated between the first nitrogen gas control valve and the second nitrogen gas control valve, and the second exhaust control valve is arranged between the first nitrogen gas control valve and the second nitrogen gas control valve. According to the ladle bottom nitrogen and argon blowing anti-cross gas switching device provided by the utility model, the exhaust branch is respectively arranged on the nitrogen branch and the argon branch, and the branch control valve is arranged, so that when one branch is used for supplying gas, the exhaust branch of the other branch is opened, and if the valve of the other branch is mechanically failed or closed and invalid, the other gas is discharged from the exhaust branch, so that gas intervention caused by the fact that the control valve is not closed or invalid is avoided.

Inventors

• WANG WENQIAO
• LI GUODONG
• CUI SIQI
• LI QING

Assignees

• 承德建龙特殊钢有限公司

Dates

Publication Date

20260512

Application Date

20250520

Claims (10)

1. 1. The utility model provides a ladle bottom blowing nitrogen argon prevents switching device that cross gas, its characterized in that, ladle bottom blowing nitrogen argon prevents switching device that cross gas includes: An argon branch and a nitrogen branch connected in parallel; The first argon gas control valve and the second argon gas control valve are sequentially arranged on the argon gas branch, a first exhaust branch is communicated between the first argon gas control valve and the second argon gas control valve, and the first exhaust branch is provided with the first exhaust control valve; The nitrogen branch is located between the first nitrogen control valve and the second nitrogen control valve and is communicated with the second exhaust branch, and the second exhaust branch is provided with the second exhaust control valve.
2. 2. The nitrogen-argon bottom blowing anti-cross-gas switching device of claim 1, further comprising a gas main pipeline, wherein the tail ends of the argon branch and the nitrogen branch are converged and connected to the air inlet end of the gas main pipeline.
3. 3. The ladle bottom blowing nitrogen-argon anti-cross gas switching device according to claim 2, wherein the tail end of the gas main pipeline is connected into a ladle bottom blowing inlet.
4. 4. The ladle bottom blowing nitrogen-argon anti-cross-gas switching device according to claim 1, wherein the first argon gas control valve, the second argon gas control valve, the first nitrogen gas control valve, the second nitrogen gas control valve, the first exhaust gas control valve and the second exhaust gas control valve each independently comprise a pneumatic ball valve.
5. 5. The nitrogen-argon bottom blowing anti-cross-gas switching device of claim 1, further comprising a control system for controlling the opening and closing of the first argon control valve, the second argon control valve, the first nitrogen control valve, the second nitrogen control valve, the first exhaust control valve and the second exhaust control valve.
6. 6. The nitrogen-argon bottom blowing anti-cross-gas switching device of claim 1, further comprising flow meters respectively arranged on the argon branch and the nitrogen branch.
7. 7. The nitrogen-argon bottom blowing anti-cross-gas switching device for the steel ladle is characterized by further comprising flow regulating valves respectively arranged on the argon branch and the nitrogen branch.
8. 8. The ladle bottom blowing nitrogen-argon anti-cross gas switching device according to claim 1, wherein the air inlet ends of the argon branch and the nitrogen branch are respectively connected with an air ladle.
9. 9. The ladle bottom blowing nitrogen-argon anti-cross gas switching device according to claim 1, wherein the argon branch, the nitrogen branch, the first exhaust branch and the second exhaust branch are respectively made of metal hoses.
10. 10. A ladle furnace, characterized in that the ladle furnace comprises a furnace body and the ladle bottom blowing nitrogen-argon anti-cross-gas switching device of any one of claims 1-9.

Description

Ladle bottom nitrogen-argon blowing anti-cross-gas switching device and ladle furnace Technical Field The utility model belongs to the technical field of steel smelting, and particularly relates to a ladle bottom nitrogen-argon blowing anti-cross-gas switching device and a ladle furnace. Background In the ladle refining process, the bottom blowing gas technology realizes fine adjustment of molten steel components and efficient removal of inclusions of a temperature homogenizing agent by injecting inert gas (such as argon or nitrogen) into the bottom of a ladle, and is a core means for improving the cleanliness and performance of steel. Because of the completely inert characteristic, the nitrogen is widely applied to smelting of high-quality steel types (such as low-carbon steel and stainless steel), can avoid chemical reaction with molten steel, and ensures the purity of the molten steel. The nitrogen has both functional origin and economical advantage in the production of specific steel types (such as high-nitrogen stainless steel and low-alloy steel), not only can the nitrogen content in the steel be regulated by dissolution, but also the process cost can be reduced. However, in order to meet the production requirements of multiple steel grades, the system needs to frequently switch the origins of argon and nitrogen, which puts a very high requirement on the reliability of the gas path switching device. If the two paths of origins are switched, residual nitrogen in an argon pipeline or dual air sources are supplied simultaneously, the control precision of the molten steel components is directly damaged. For example, high nitrogen steel is diluted by argon to cause insufficient nitrogen content, or low carbon steel is catalyzed by nitrogen permeation to cause nitrogen increase, and even the whole furnace molten steel is scrapped in severe cases. In addition, gas mixing can interfere with the distribution of the flow field in the ladle, so that the adsorption and floating capacity of bubbles to inclusions are weakened, and oxide inclusion residues are caused. Therefore, physical isolation between gas paths is a core difficulty in system design. CN216786185U discloses a fast nitrogen-argon switching device for ladle bottom blowing of a refining furnace, which comprises an air inlet pipe, two manual valves and two bypass valves, wherein the air inlet pipe is sequentially provided with a pressure reducing valve and a total cut-off valve in series, an outlet pipe of the total cut-off valve is connected with two air inlet branch pipes, the two manual valves are respectively arranged on the two air inlet branch pipes, the two air inlet branch pipes behind the two manual valves are respectively provided with a pneumatic cut-off valve, the two pneumatic cut-off valves are respectively provided with a bypass pipeline in parallel, and the bypass pipeline is respectively provided with the two bypass valves. CN217781203U discloses a ladle bottom nitrogen blowing argon blowing switching and metering control system, which comprises a nitrogen pipeline, an argon pipeline, a main pipeline and two groups of tapping pipelines, wherein the ladle is provided with two blowing holes which are a first blowing hole and a second blowing hole respectively, the nitrogen pipeline and the argon pipeline are connected in parallel to the air inlet end of the main pipeline, one group of the component connecting pipelines are used for connecting the main pipeline with the first blowing hole, and the other group of the component connecting pipelines are used for connecting the main pipeline with the second blowing hole. The existing nitrogen-argon switching pipeline is generally provided with two branches, and the switching of nitrogen-argon gas is controlled through a pipeline valve, however, if the valve has mechanical failure, sealing failure or control logic error, the gas can be easily mixed. Therefore, the design of preventing gas leakage through a pipeline structure is needed to ensure the reliable gas switching, thereby ensuring the strict standard of steel components and the stability of a smelting process. Disclosure of utility model The utility model aims to provide a ladle bottom nitrogen and argon blowing anti-cross gas switching device and a ladle furnace, which are used for ladle bottom nitrogen and argon blowing conversion and preventing cross gas. In order to achieve the aim of the utility model, the utility model adopts the following technical scheme: In a first aspect, the present utility model provides a ladle bottom blowing nitrogen-argon anti-cross-gas switching device, where the ladle bottom blowing nitrogen-argon anti-cross-gas switching device includes: An argon branch and a nitrogen branch connected in parallel; The first argon gas control valve and the second argon gas control valve are sequentially arranged on the argon gas branch, a first exhaust branch is communicated between the first argon gas control valve a