Composite device for preventing air leakage and molten steel backflow of steel ladle pipeline

Abstract

The utility model relates to a composite device for preventing air leakage and molten steel backflow of a steel ladle pipeline, which is characterized by comprising a steel ladle air brick, a metal hose, a pressure container, a one-way valve, an air inlet pipeline and a quick connector, the number of the metal hoses is two, one end of each metal hose is connected with one independent steel ladle air brick, and the other end of each metal hose is connected to an air outlet of the pressure container. The one-way valve is arranged on an air inlet pipeline of the pressure container in series, and the air flow direction of the one-way valve is in one-way conduction from an external air source to a steel ladle air brick. The air inlet end of the air inlet pipeline is communicated with an external air source through a quick connector. According to the composite device for preventing air leakage and molten steel backflow of the steel ladle pipeline, through unique design and component cooperation, air leakage and molten steel backflow are effectively prevented, production safety and stability are guaranteed, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of iron and steel smelting technology, and in particular relates to a composite device for preventing air leakage in steel ladle pipelines and for molten steel recirculation. Background Technology

[0002] In the argon blowing process of molten steel in iron and steel smelting, the single gas source and double permeable brick mode is a common operating method. In this mode, a three-way valve needs to be added between the gas source and the permeable bricks to supply gas. However, the three-way valve itself has a large number of interfaces, making it prone to leakage during long-term use. Leakage not only leads to unstable gas pressure during argon blowing, affecting the uniform distribution of gas in the molten steel and thus reducing the blowing effect, but also may cause safety hazards, threatening the production environment and personnel safety.

[0003] Besides gas leakage, the argon blowing process also faces the risk of molten steel backflow. In actual production, situations such as gas supply interruption, damage to the permeable bricks, or operator error can occur. If these situations arise, molten steel may flow back into the permeable bricks and further into the piping system. Once inside the pipes, molten steel causes gas leakage, severely disrupting the normal gas supply and distribution, and significantly impacting the argon blowing effect. More seriously, molten steel backflow can also cause pipe blockage, resulting in impermeability and preventing the argon blowing process from proceeding normally. Furthermore, the high temperature of the molten steel causes severe thermal shock and corrosion to the permeable bricks and pipes, leading to damage, increased equipment maintenance costs and downtime, and severely impacting the efficiency and economic benefits of steel production.

[0004] In summary, pipeline leakage and molten steel backflow during argon blowing seriously affect the blowing efficiency and the normal operation of steel production. Therefore, it is necessary to develop a composite device that can effectively prevent pipeline leakage and molten steel backflow. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model provides the following.

[0006] This utility model is implemented as follows: a composite device for preventing air leakage and molten steel backflow in a ladle pipeline, characterized by comprising a ladle permeable brick, a metal hose, a pressure vessel, a one-way valve, an air inlet pipe, and a quick connector; two metal hoses are provided, one end of each metal hose is connected to an independent ladle permeable brick, and the other end is connected to the air outlet of the pressure vessel; the one-way valve is connected in series on the air inlet pipe of the pressure vessel, and the airflow direction of the one-way valve is unidirectional from the external air source to the ladle permeable brick; the air inlet end of the air inlet pipe is connected to the external air source through the quick connector.

[0007] More preferably, the metal hose and the breathable brick are connected by welding or sleeve connection.

[0008] More preferably, the pressure vessel has a volume of 0.5-2L and is made of high-temperature resistant stainless steel.

[0009] More preferably, the intake pipe is made of a rigid metal pipe.

[0010] Further preferably, the metal hose and air inlet pipe are covered with a fire-resistant fiber insulation layer with a thickness of 10-20mm.

[0011] The advantages and technical effects of this utility model are as follows: The composite device for preventing air leakage and preventing molten steel backflow in the ladle pipeline of this utility model uses two flexible metal hoses connected to two independent ventilated bricks in the ladle, ensuring independent gas supply. Their flexibility can buffer vibration and displacement, reducing damage to the ventilated bricks and connecting parts. The metal hoses and ventilated bricks are connected by welding or sleeve, which is both secure and easy to replace. The metal hoses and air inlet pipes are covered with a refractory fiber insulation layer, reducing heat transfer, lowering gas pressure fluctuations, and protecting the pipeline from thermal shock. A one-way valve is connected in series on the pressure vessel's air inlet pipe, allowing airflow to flow unidirectionally from the external gas source to the ventilated bricks in the ladle. It automatically shuts off in case of gas source interruption or abnormality, preventing molten steel backflow and protecting the gas source equipment and pipeline system. The air inlet pipe is constructed of rigid metal tubing, which has high strength and good pressure resistance, reducing gas flow resistance. The pressure vessel is made of high-temperature resistant stainless steel with a reasonable volume to meet gas storage and buffering requirements, ensuring stable operation of the device, improving production safety, and reducing maintenance costs and downtime. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1. Steel ladle permeable brick; 2. Metal hose; 3. Pressure vessel; 4. One-way valve; 5. Air inlet pipe; 6. Quick connector. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0015] Please see Figure 1A composite device for preventing air leakage and molten steel backflow in ladle pipelines includes a ladle permeable brick 1, a metal flexible hose 2, a pressure vessel 3, a one-way valve 4, an air inlet pipe 5, and a quick connector 6. Two metal flexible hoses are provided, each with one end connected to an independent ladle permeable brick 1 and the other end connected to the air outlet of the pressure vessel 3. The two metal flexible hoses, each connected to an independent ladle permeable brick, ensure independent air supply to each brick without interference. The metal flexible hoses possess a certain degree of flexibility, which can buffer vibration and displacement during the argon blowing process of molten steel, reducing damage to the permeable bricks and connection points caused by pipeline stress, lowering the risk of air leakage, and facilitating installation and maintenance.

[0016] The one-way valve 4 is connected in series on the air inlet pipe of the pressure vessel. The airflow direction of the one-way valve is unidirectional, from the external air source to the permeable brick of the ladle; this effectively prevents molten steel from flowing back into the air source pipeline. When the air supply is interrupted or an abnormal situation occurs, the one-way valve can automatically close, preventing molten steel backflow, protecting the air source equipment and pipeline system, and ensuring production safety.

[0017] The air inlet end of the air inlet pipe 5 is connected to an external air source via a quick connector 6, facilitating quick connection and disconnection of the air source pipe and improving installation and maintenance efficiency. The quick connector has excellent sealing performance, effectively preventing air leakage and ensuring the stability and reliability of the gas supply.

[0018] More preferably, the metal hose and the permeable brick are connected by welding or sleeve connection. Welding connection can form a strong and sealed connection between the metal hose and the permeable brick, withstand higher pressure and temperature, and reduce the risk of air leakage; sleeve connection is convenient for installation and disassembly, and can be completed quickly when the permeable brick or metal hose needs to be replaced, reducing maintenance difficulty and time cost, while ensuring the sealing of the connection.

[0019] Preferably, the pressure vessel has a volume of 0.5-2L and is made of high-temperature resistant stainless steel. This satisfies the storage and buffering requirements for gas within a certain timeframe without increasing the device's size and cost due to excessive volume. The high-temperature resistant stainless steel construction allows it to withstand the high-temperature environment during the argon blowing process from molten steel, ensuring the pressure vessel's strength and sealing, extending its service life, and ensuring stable operation of the device.

[0020] More preferably, the intake pipe is constructed of a rigid metal tube. Rigid metal tubes possess high strength and pressure resistance, enabling them to withstand gas pressure and the influence of the external environment, ensuring the stability of gas delivery. Simultaneously, rigid metal tubes are not easily deformed, reducing gas flow resistance, improving gas delivery efficiency, and lowering the risk of leakage.

[0021] Further preferably, the metal flexible hose and air inlet pipe are covered with a refractory fiber insulation layer, with a thickness of 10-20mm. This effectively reduces heat transfer, lowers pressure fluctuations caused by temperature changes in the gas within the pipeline, and ensures the stability of the gas supply. Simultaneously, the insulation layer protects the pipeline from the thermal shock of high-temperature molten steel, extending the pipeline's service life and improving the safety and reliability of the device.

[0022] In summary, the overall design of this composite device aims to solve the problems of pipeline leakage and molten steel backflow during argon blowing of molten steel. The various components work together, and through rational layout and special design, ensure a stable gas supply, prevent molten steel backflow, improve argon blowing efficiency and steel production quality, guarantee production safety, and reduce equipment maintenance costs and downtime.

[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite device for preventing air leakage and molten steel backflow in a steel ladle pipeline, characterized in that, The system includes a ladle permeable brick, a metal hose, a pressure vessel, a one-way valve, an air inlet pipe, and a quick connector. Two metal hoses are provided, each with one end connected to an independent ladle permeable brick and the other end connected to the air outlet of the pressure vessel. The one-way valve is connected in series on the air inlet pipe of the pressure vessel, with the airflow direction of the one-way valve being unidirectional, from an external air source to the ladle permeable brick. The air inlet end of the air inlet pipe is connected to an external air source via a quick connector.

2. The composite device for preventing air leakage and molten steel backflow in a ladle pipeline according to claim 1, characterized in that: The metal hose is connected to the breathable brick by welding or sleeve connection.

3. The composite device for preventing air leakage and molten steel backflow in steel ladle pipelines according to claim 1, characterized in that: The pressure vessel has a volume of 0.5-2L and is made of high-temperature resistant stainless steel.

4. The composite device for preventing air leakage and molten steel backflow in a ladle pipeline according to claim 1, characterized in that: The intake pipe is made of rigid metal tubing.

5. The composite device for preventing air leakage and molten steel backflow in a ladle pipeline according to claim 1, characterized in that: The metal hoses and air inlet pipes are covered with a fire-resistant fiber insulation layer with a thickness of 10-20mm.

Images