Steel ladle bottom blowing nitrogen and argon blow-by preventing switching device and steel ladle furnace
By setting up an exhaust branch and control valve in the bottom-blowing nitrogen-argon gas switching device for the ladle, the problem of cross-contamination during gas switching was solved, enabling precise control of the steel composition and stability of the smelting process, thus ensuring steel quality and production reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDE JIANLONG SPECIAL STEEL
- Filing Date
- 2025-05-20
- Publication Date
- 2026-05-12
AI Technical Summary
Existing bottom-blowing nitrogen-argon switching devices for ladles are prone to cross-contamination during gas path switching, leading to decreased accuracy in steel composition control and instability in the smelting process. In particular, it is difficult to effectively prevent gas mixing when valve mechanical failure or seal failure occurs.
A bottom-blown nitrogen-argon gas switching device for steel ladle is designed. By setting exhaust branches and control valves on the nitrogen and argon branches respectively, it is ensured that when one branch is supplied with gas, the exhaust branch of the other branch is opened. If the valve of the other branch malfunctions or fails to seal, the gas is discharged through the exhaust branch, thus avoiding gas cross-contamination.
It effectively prevents gas intrusion, ensuring that the steel composition meets strict standards and the smelting process is stable, and avoiding gas mixing interference caused by valve failure or seal failure.
Smart Images
Figure CN224229758U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of iron and steel smelting technology, specifically relating to a ladle bottom blowing nitrogen and argon anti-cross-gas switching device and a ladle furnace. Background Technology
[0002] In ladle refining processes, bottom-blowing gas technology, by injecting inert gases (such as argon or nitrogen) into the bottom of the ladle, achieves fine-tuning of steel composition, temperature homogenization, and efficient removal of inclusions, making it a core means of improving steel cleanliness and performance. Nitrogen, due to its complete inertness, is widely used in the smelting of high-quality steels (such as low-carbon steel and stainless steel) to avoid chemical reactions with molten steel and ensure its purity. Nitrogen also offers both functional and economic advantages in the production of specific steels (such as high-nitrogen stainless steel and low-alloy steel), adjusting nitrogen content through dissolution while reducing process costs. However, to meet the production needs of multiple steel types, the system requires frequent switching between argon and nitrogen gas sources, placing extremely high demands on the reliability of the gas path switching device.
[0003] If cross-contamination occurs during the switching between the two gas sources, such as residual nitrogen in the argon pipeline or simultaneous supply from two gas sources, it will directly compromise the precision of steel composition control. For example, high-nitrogen steel may suffer from insufficient nitrogen content due to argon dilution, or low-carbon steel may experience nitrogen catalysis due to nitrogen infiltration, potentially leading to the scrapping of the entire furnace of steel. Furthermore, gas mixing can interfere with the flow field distribution within the ladle, weakening the ability of bubbles to adsorb and float inclusions, resulting in residual oxide inclusions. Therefore, physical isolation between gas lines is a core challenge in system design.
[0004] CN216786185U discloses a rapid nitrogen-argon switching device for bottom blowing of a refining furnace ladle, comprising an inlet pipe, two manual valves, and two bypass valves. A pressure reducing valve and a main shut-off valve are connected in series on the inlet pipe. Two inlet branch pipes are connected to the outlet pipe of the main shut-off valve. The two manual valves are respectively installed on the two inlet branch pipes. A pneumatic shut-off valve is installed on each of the two inlet branch pipes following the two manual valves. A bypass pipeline is connected in parallel to each of the two pneumatic shut-off valves, and the two bypass valves are respectively installed on the bypass pipelines. CN217781203U discloses a nitrogen-argon switching and metering control system for bottom blowing of a ladle, comprising a nitrogen pipeline, an argon pipeline, a main pipeline, and two sets of connecting pipelines. The ladle has two blowing holes, a first blowing hole and a second blowing hole. The nitrogen pipeline and the argon pipeline are connected in parallel to the inlet end of the main pipeline. One set of connecting pipelines connects the main pipeline and the first blowing hole, and the other set of connecting pipelines connects the main pipeline and the second blowing hole. Existing nitrogen-argon gas switching pipelines typically have two branches, with the switching of nitrogen and argon gases controlled by pipeline valves. However, if the valves experience mechanical failure, seal failure, or control logic errors, cross-contamination can easily occur.
[0005] Therefore, it is necessary to ensure reliable gas switching through pipeline structure anti-cross-gas design, thereby guaranteeing the strict compliance of steel composition and the stability of smelting process. Utility Model Content
[0006] The purpose of this invention is to provide a ladle bottom-blowing nitrogen-argon anti-cross-flow switching device and a ladle furnace, which is used for the switching of bottom-blowing nitrogen and argon in a ladle and to prevent cross-flow.
[0007] To achieve the objective of this utility model, the following technical solution is adopted:
[0008] In a first aspect, this utility model provides a ladle bottom-blowing nitrogen-argon cross-flow prevention switching device, the ladle bottom-blowing nitrogen-argon cross-flow prevention switching device comprising:
[0009] The argon and nitrogen gas branches are connected in parallel;
[0010] The argon branch is sequentially provided with a first argon control valve and a second argon control valve. The argon branch is connected to a first exhaust branch between the first argon control valve and the second argon control valve. The first exhaust branch is provided with a first exhaust control valve.
[0011] The nitrogen branch is provided with a first nitrogen control valve and a second nitrogen control valve in sequence. The nitrogen branch is located between the first nitrogen control valve and the second nitrogen control valve and is connected to a second exhaust branch. The second exhaust branch is provided with a second exhaust control valve.
[0012] This utility model provides a gas pipeline structure for bottom blowing nitrogen and argon switching in steel ladles that can prevent cross-flow. Based on parallel nitrogen and argon branches, control valves and exhaust branches are set in the gas branches respectively. The exhaust branches and control valves work together to prevent cross-flow of gas.
[0013] The control valve coordination and operating method of the ladle bottom-blowing nitrogen-argon anti-cross-gas switching device are as follows:
[0014] When the bottom-blowing gas is argon, the first argon control valve and the second argon control valve remain open on the argon branch, the first exhaust control valve remains closed on the first exhaust branch, and the first nitrogen control valve and the second nitrogen control valve remain closed on the nitrogen branch, while the second exhaust control valve remains open on the second exhaust branch.
[0015] When the bottom-blowing gas is nitrogen, the first nitrogen control valve and the second nitrogen control valve remain open on the nitrogen branch, the second exhaust control valve remains closed on the second exhaust branch, the second argon control valve and the second argon control valve remain closed on the argon branch, and the first exhaust control valve remains open on the first exhaust branch.
[0016] When one branch is supplied with gas, its control valve opens, allowing gas to flow through the branch into the ladle for bottom blowing. The exhaust branch connected to this branch closes, preventing gas from escaping to the outside. Simultaneously, the control valve of the other branch closes, preventing the supply of gas from that branch. However, the exhaust branch of the other branch opens. If the valve of the other branch experiences a mechanical failure or malfunction, the gas from that branch will be discharged from the exhaust branch instead of being supplied into the ladle. This prevents gas from entering the ladle due to a control valve not being fully closed or malfunctioning, thus achieving the function of preventing cross-contamination.
[0017] Preferably, the bottom-blown nitrogen-argon anti-cross-gas switching device for the ladle further includes: a main gas pipeline, wherein the ends of the argon branch and the nitrogen branch converge and are connected to the inlet of the main gas pipeline.
[0018] Preferably, the end of the main gas pipeline is connected to the bottom blowing inlet of the ladle.
[0019] Preferably, 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 each independently include a pneumatic ball valve.
[0020] Preferably, the bottom-blown nitrogen-argon anti-cross-gas switching device for the ladle further includes: a control system, which is used to control 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.
[0021] Preferably, the bottom-blowing nitrogen-argon anti-cross-gas switching device for the ladle further includes: flow meters installed on the argon branch and the nitrogen branch respectively.
[0022] Preferably, the bottom-blowing nitrogen-argon anti-cross-gas switching device for the ladle further includes: flow regulating valves are respectively installed on the argon branch and the nitrogen branch.
[0023] Preferably, the inlet ends of the argon branch and the nitrogen branch are respectively connected to a gas manifold.
[0024] Preferably, the argon branch, nitrogen branch, first exhaust branch, and second exhaust branch are all made of flexible metal tubing.
[0025] This utility model provides a method for switching between nitrogen and argon bottom-blowing in a steel ladle to prevent cross-gas flow. The method for switching between nitrogen and argon bottom-blowing in a steel ladle to prevent cross-gas flow is as follows:
[0026] When the bottom-blowing gas is argon, the control system keeps the first and second argon control valves open and the first exhaust control valve closed. Argon is supplied from the gas tank to the argon branch from the inlet end. The flow regulating valve adjusts the argon flow rate according to the flow meter. The argon is then transported from the argon branch to the ladle via the main gas pipeline. At the same time, the control system keeps the first and second nitrogen control valves closed and the second exhaust control valve open. Nitrogen is not supplied. If the first and / or second nitrogen control valves have mechanical failures or poor sealing, nitrogen is discharged from the second exhaust branch, and no cross-contamination occurs.
[0027] When the bottom-blowing gas is nitrogen, the control system keeps the first and second nitrogen control valves open and the second exhaust control valve closed. Nitrogen is supplied from the gas tank to the nitrogen branch from the inlet end. The flow regulating valve adjusts the nitrogen flow rate according to the flow meter. The nitrogen is then transported from the nitrogen branch to the ladle via the main gas pipeline. At the same time, the control system keeps the first and second argon control valves closed and the first exhaust control valve open. Argon is not supplied. If the first and / or second argon control valves have mechanical failures or poor sealing, argon is discharged from the first exhaust branch, and no cross-contamination occurs.
[0028] Secondly, this utility model provides a ladle furnace, which includes a furnace body and the ladle bottom blowing nitrogen-argon anti-cross-flow switching device described in the first aspect.
[0029] Compared with the prior art, the present invention has the following beneficial effects:
[0030] The steel ladle bottom blowing nitrogen and argon anti-cross-gas switching device provided by this utility model sets exhaust branches and branch control valves on the nitrogen and argon branches respectively. When one branch is supplied with gas, the exhaust branch of the other branch is opened. If the valve of the other branch has mechanical failure or sealing failure, the other gas is discharged from the exhaust branch, thereby avoiding gas intervention caused by the control valve not being closed properly or failing. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the structure of the bottom-blown nitrogen-argon anti-cross-gas switching device for the steel ladle provided in Example 1;
[0032] Wherein, 10 is the argon branch; 101 is the first argon control valve; 102 is the second argon control valve; 11 is the first exhaust branch; 111 is the first exhaust control valve; 20 is the nitrogen branch; 201 is the first nitrogen control valve; 202 is the second nitrogen control valve; 21 is the second exhaust branch; 211 is the second exhaust control valve; and 30 is the main gas pipeline. Detailed Implementation
[0033] It should be understood that in the description of this utility model, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0034] It should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0036] Example 1
[0037] This embodiment provides a method such as Figure 1 The shown ladle bottom-blowing nitrogen-argon cross-flow prevention switching device includes:
[0038] Argon branch 10 and nitrogen branch 20;
[0039] Argon branch 10 and nitrogen branch 20 are connected in parallel. The ends of argon branch 10 and nitrogen branch 20 merge and are connected to the inlet of gas main pipeline 30. The end of gas main pipeline 30 is connected to the bottom blow-out inlet of ladle.
[0040] A first argon control valve 101 and a second argon control valve 102 are sequentially installed on the argon branch 10.
[0041] Argon branch 10 is connected to first exhaust branch 11 between first argon control valve 101 and second argon control valve 102, and first exhaust control valve 111 is provided on first exhaust branch 11.
[0042] A first nitrogen control valve 201 and a second nitrogen control valve 202 are sequentially installed on the nitrogen branch 20.
[0043] The nitrogen branch 20 is connected to the second exhaust branch 21 between the first nitrogen control valve 201 and the second nitrogen control valve 202, and the second exhaust branch 21 is equipped with a second exhaust control valve 211.
[0044] The first argon control valve 101, the second argon control valve 102, the first nitrogen control valve 201, the second nitrogen control valve 202, the first exhaust control valve 111, and the second exhaust control valve 211 are each independently pneumatic ball valves.
[0045] The first argon control valve 101, the second argon control valve 102, the first nitrogen control valve 201, the second nitrogen control valve 202, the first exhaust control valve 111, and the second exhaust control valve 211 are electrically connected to the control system, which is used to control the opening and closing of the aforementioned control valves. The connection method between the control system and the control valves, as well as the control system's control of the opening and closing of the control valves, are existing technologies and will not be described in detail here.
[0046] Both the argon branch 10 and the nitrogen branch 20 are equipped with flow meters and flow regulating valves, which are used to read and control the flow rate of argon or nitrogen.
[0047] The inlet ends of argon branch 10 and nitrogen branch 20 are respectively connected to gas bags.
[0048] Argon branch 10, nitrogen branch 20, first exhaust branch 11 and second exhaust branch 21 are all made of metal hoses.
[0049] This embodiment also provides a method for switching between nitrogen and argon bottom-blowing gas in a ladle to prevent cross-gas flow, the method being as follows:
[0050] When the bottom-blowing gas is argon, the control system keeps the first argon control valve 101 and the second argon control valve 102 open, and the first exhaust control valve 111 closed. Argon is supplied from the gas tank to the argon branch 10 from the inlet end. The flow regulating valve adjusts the argon flow rate according to the flow meter. The argon is then transported from the argon branch 10 to the ladle via the main gas pipeline 30. At the same time, the control system keeps the first nitrogen control valve 201 and the second nitrogen control valve 202 closed, and the second exhaust control valve 211 open. Nitrogen is not supplied. If the first nitrogen control valve 201 and / or the second nitrogen control valve 202 have mechanical failures or poor sealing, nitrogen is discharged from the second exhaust branch, and no cross-contamination occurs.
[0051] When the bottom-blowing gas is nitrogen, the control system keeps the first nitrogen control valve 201 and the second nitrogen control valve 202 open, and the second exhaust control valve 211 closed. Nitrogen is supplied from the gas tank to the nitrogen branch 20 from the inlet end. The flow regulating valve adjusts the nitrogen flow rate according to the flow meter. The nitrogen is then transported from the nitrogen branch 20 to the ladle via the main gas pipeline 30. At the same time, the control system keeps the first argon control valve 101 and the second argon control valve 102 closed, and the first exhaust control valve 111 open. Argon is not supplied. If the first argon control valve 101 and / or the second argon control valve 102 have mechanical failures or poor sealing, the argon is discharged from the first exhaust branch 11, and no cross-contamination occurs.
[0052] This embodiment also provides a ladle furnace, which includes a furnace body and a ladle bottom blowing nitrogen-argon anti-cross-flow switching device.
[0053] In summary, the ladle bottom-blowing nitrogen-argon anti-cross-gas switching device provided by this utility model sets exhaust branches and branch control valves on the nitrogen and argon branches respectively. When one branch is supplied with gas, the exhaust branch of the other branch is opened. If the valve of the other branch has a mechanical failure or fails to close, the other gas is discharged from the exhaust branch, thereby avoiding gas intrusion caused by the control valve not being closed properly or failing.
[0054] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.
Claims
1. A bottom-blown nitrogen-argon anti-cross-gas switching device for a steel ladle, characterized in that, The ladle bottom-blowing nitrogen-argon anti-cross-gas switching device includes: The argon and nitrogen gas branches are connected in parallel; The argon branch is sequentially provided with a first argon control valve and a second argon control valve. The argon branch is connected to a first exhaust branch between the first argon control valve and the second argon control valve. The first exhaust branch is provided with a first exhaust control valve. The nitrogen branch is provided with a first nitrogen control valve and a second nitrogen control valve in sequence. The nitrogen branch is located between the first nitrogen control valve and the second nitrogen control valve and is connected to a second exhaust branch. The second exhaust branch is provided with a second exhaust control valve.
2. The ladle bottom-blowing nitrogen-argon anti-cross-gas switching device according to claim 1, characterized in that, The bottom-blowing nitrogen-argon anti-cross-gas switching device for the steel ladle further includes: a main gas pipeline, wherein the ends of the argon branch and the nitrogen branch converge and are connected to the inlet of the main gas pipeline.
3. The ladle bottom-blowing nitrogen-argon anti-cross-gas switching device according to claim 2, characterized in that, The end of the main gas pipeline is connected to the bottom blowing inlet of the ladle.
4. The ladle bottom-blowing nitrogen-argon anti-cross-gas switching device according to claim 1, characterized in that, 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 each independently include a pneumatic ball valve.
5. The ladle bottom-blowing nitrogen-argon anti-cross-gas switching device according to claim 1, characterized in that, The bottom-blowing nitrogen-argon anti-cross-gas switching device for the steel ladle further includes a control system, which is used to control 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. The ladle bottom-blowing nitrogen-argon anti-cross-gas switching device according to claim 1, characterized in that, The bottom-blowing nitrogen-argon anti-cross-gas switching device for the ladle also includes flow meters installed on the argon branch and the nitrogen branch, respectively.
7. The ladle bottom-blowing nitrogen-argon anti-cross-gas switching device according to claim 1, characterized in that, The bottom-blowing nitrogen-argon anti-cross-gas switching device for the ladle also includes: flow regulating valves are respectively installed on the argon branch and the nitrogen branch.
8. The ladle bottom-blowing nitrogen-argon anti-cross-gas switching device according to claim 1, characterized in that, The inlet ends of the argon branch and the nitrogen branch are respectively connected to the gas manifold.
9. The ladle bottom-blowing nitrogen-argon anti-cross-gas switching device according to claim 1, characterized in that, The argon branch, nitrogen branch, first exhaust branch, and second exhaust branch are each made of flexible metal tubing.
10. A ladle furnace, characterized in that, The ladle furnace includes a furnace body and a ladle bottom-blowing nitrogen-argon anti-cross-gas switching device as described in any one of claims 1-9.