Safety emergency protection device for AOD (Argon Oxygen Decarburization) furnace

Abstract

The utility model relates to the technical field of stainless steel smelting, and discloses an AOD furnace safety emergency protection device which comprises an argon supply pipeline connected with a main gun gas inlet pipe and an auxiliary gun gas inlet pipe. The nitrogen gas supply pipeline is respectively connected with the main gun gas inlet pipe and the auxiliary gun gas inlet pipe; the gas inlet end of the accident gas pipeline is connected with an argon gas supply pipeline so that the accident gas pipeline can be communicated with the argon gas supply pipeline, and a first branch connected with a main gun gas inlet pipe and a second branch connected with a sublance gas inlet pipe are arranged at a first node of the accident gas pipeline in a split-flow mode. And the accident gas pipeline is provided with an accident gas control valve for controlling the on-off of the accident gas pipeline, and the accident gas control valve is closed in a power-on state and is opened in a power-off state so as to conduct the accident gas pipeline. The device has the beneficial effects that the influence of sudden power failure on equipment and production can be effectively reduced, the whole production rhythm is ensured, and the operation stability of the equipment is also ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of stainless steel smelting, in particular to an AOD furnace safety emergency protection device. Background Art

[0002] AOD furnace (argon oxygen decarburization furnace) is a refining equipment of argon oxygen refining method. Its appearance is similar to that of converter. Its principle of smelting low-carbon alloy is to input oxygen and inert gas into high-temperature molten metal solution, so as to oxidize and remove impurities such as carbon, sulfur and phosphorus in the metal solution.

[0003] The smelting process has particularly high requirements for the continuous stability of the power system, but there are always external irresistible factors, perhaps the weather, perhaps human operating errors, or perhaps the failure of some components of the equipment that leads to sudden power outages. The AOD furnace in the smelting process is particularly important. In the event of a sudden power outage, the main and auxiliary guns on the furnace can be burned out instantly. If such equipment accidents occur, the casting will be stopped directly, resulting in low production efficiency; in serious cases, the equipment will be burned out, the furnace will be burned through, and the molten steel will leak out and cause explosions, resulting in casualties. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the above prior art and to provide an AOD furnace safety emergency protection device capable of coping with sudden power failure.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An AOD furnace safety emergency protection device, comprising:

[0007] An argon gas supply pipeline, the argon gas supply pipeline is connected to the main gun air inlet pipe and the auxiliary gun air inlet pipe respectively, an argon gas inlet valve for controlling the on-off of the argon gas supply pipeline is installed at the first node of the argon gas supply pipeline, the argon gas inlet valve is opened in an energized state to conduct the argon gas supply pipeline, and is closed in a de-energized state;

[0008] A nitrogen gas supply pipeline, the nitrogen gas supply pipeline is connected to the main gun gas inlet pipe and the auxiliary gun gas inlet pipe respectively, a nitrogen gas inlet valve for controlling the on-off of the nitrogen gas supply pipeline is installed at the first node of the nitrogen gas supply pipeline, the nitrogen gas inlet valve is opened in an energized state to conduct the nitrogen gas supply pipeline, and is closed in an unenergized state;

[0009] An accident gas pipeline, wherein the air inlet end of the accident gas pipeline is connected to the second node of the argon gas supply pipeline to make the accident gas pipeline and the argon gas supply pipeline conduct. The second node of the argon gas supply pipeline is located between the air inlet end of the argon gas supply pipeline and the first node of the argon gas supply pipeline. The first node of the accident gas pipeline is divided into a first branch connected to the main gun air inlet pipe and a second branch connected to the auxiliary gun air inlet pipe. An accident gas control valve for controlling the on and off of the accident gas pipeline is installed at the second node of the accident gas pipeline. The accident gas control valve is closed when powered on and opened when powered off to conduct the accident gas pipeline. The second node of the accident gas pipeline is located between the air inlet end of the accident gas pipeline and the first node of the accident gas pipeline.

[0010] Furthermore, it also includes a purge air pipeline, and the first node of the purge air pipeline is equipped with a purge air inlet valve for controlling the on and off of the purge air pipeline, the purge air inlet valve is opened when powered on to conduct the purge air pipeline, and is closed when powered off; the second node of the purge air pipeline is connected to the first node of the accident air pipeline, so that the purge air pipeline is connected to the main gun air intake pipe through the first branch, and is connected to the auxiliary gun air intake pipe through the second branch, and the first node of the purge air pipeline is located between the air intake end of the purge air pipeline and the second node of the purge air pipeline.

[0011] Furthermore, it also includes a backup furnace shaking system, which includes a compressed air pipeline, an emergency furnace shaking control valve, a brake cylinder, a pneumatic motor and a dual-axis reducer; the compressed air pipeline supplies air to the brake cylinder and the pneumatic motor through the emergency furnace shaking control valve, and the emergency furnace shaking control valve is used to control the brake cylinder to open the brake wheel brake of the reducer when it is energized, and drive the pneumatic motor to operate; the emergency furnace shaking control valve is used to control the brake cylinder to cancel the opening of the brake wheel brake of the reducer when it is de-energized, the first input shaft of the dual-axis reducer is connected to the furnace shaking motor, the second input shaft of the dual-axis reducer is connected to the pneumatic motor, and the output end of the dual-axis reducer is connected to the furnace tilting device.

[0012] Furthermore, the compressed air pipeline is installed with a compressed air intake valve for controlling the on-off of the compressed air pipeline.

[0013] Furthermore, the accident gas control valve includes a ball valve and a control solenoid valve; the ball valve is located at the second node of the accident gas pipeline, and the control solenoid valve is connected to the ball valve to control the opening and closing of the ball valve.

[0014] Furthermore, the argon gas supply pipeline includes an argon gas main pipeline, a first cooling gas branch and a second cooling gas branch. The first node and the second node of the argon gas supply pipeline are both located in the argon gas main pipeline. The argon gas main pipeline is connected to the main gun air inlet pipe through the first cooling gas branch, and the argon gas main pipeline is connected to the auxiliary gun air inlet pipe through the second cooling gas branch.

[0015] Furthermore, it also includes a main gun cooling air flow meter, a main gun cooling air thermometer, a main gun cooling air pressure transmitter, a main gun cooling air regulating valve and a main gun cooling air outlet valve; the main gun cooling air flow meter, main gun cooling air thermometer, main gun cooling air pressure transmitter, main gun cooling air regulating valve and main gun cooling air outlet valve are installed in the first cooling air branch in sequence along the air flow direction.

[0016] Furthermore, it also includes a secondary gun cooling air flow meter, a secondary gun cooling air thermometer, a secondary gun cooling air pressure transmitter, a secondary gun cooling air regulating valve, and a secondary gun cooling air outlet valve; the secondary gun cooling air flow meter, secondary gun cooling air thermometer, secondary gun cooling air pressure transmitter, secondary gun cooling air regulating valve, and secondary gun cooling air outlet valve are installed in the second cooling air branch in sequence along the airflow direction.

[0017] Furthermore, the nitrogen gas supply pipeline is connected to the third node of the argon gas main pipeline, and is connected to the main gun air inlet pipe through the first cooling gas branch, and is connected to the auxiliary gun air inlet pipe through the second cooling gas branch. The third node of the argon gas main pipeline is located between the second node of the argon gas supply pipeline and the first cooling gas branch.

[0018] Furthermore, it also includes an oxygen supply pipeline, which is connected to the main gun air inlet pipe, and the oxygen supply pipeline is equipped with a main gun oxygen inlet valve, a main gun oxygen flow meter, a main gun oxygen thermometer, a main gun oxygen pressure transmitter, a main gun oxygen regulating valve and a main gun oxygen outlet valve in sequence along the air flow direction.

[0019] Furthermore, one-way valves are installed on the oxygen supply pipeline near the main gun air inlet pipe, the first branch near the main gun air inlet pipe, the first cooling air branch near the main gun air inlet pipe, the second cooling air branch near the auxiliary gun air inlet pipe, the second branch near the auxiliary gun air inlet pipe, and the compressed air pipeline near the brake cylinder.

[0020] The utility model has the following advantages over the prior art:

[0021] 1. The AOD furnace safety emergency protection device of the utility model is provided with an accident gas pipeline connected to the argon gas supply pipeline. When a sudden power outage occurs, the accident gas control valve automatically opens, and the accident gas pipeline is connected to the main gun and the auxiliary gun to pass argon cooling gas. The application of this emergency protection device can greatly reduce the impact of equipment accidents on equipment and production, and can also make up for human deficiencies. In the event of an emergency, the loss can be minimized, ensuring the entire production rhythm and the stability of equipment operation.

[0022] 2. The AOD furnace safety emergency protection device of the utility model is also provided with a backup furnace shaking system, which is powered by a UPS uninterruptible power supply. The reducer is set as a double-axis reducer, and the furnace can be driven to shake by a furnace shaking motor or a pneumatic motor. When power is off or the AOD furnace fails (the furnace shaking motor cannot work), the compressed air inlet valve and the emergency furnace shaking control valve are opened, and the compressed air drives the pneumatic motor to work. In an emergency, the furnace body can be shaken to a safe state. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the AOD furnace safety emergency protection device in the embodiment of the utility model;

[0024] Figure 2 This is a control circuit diagram of the accident gas control valve in the AOD furnace safety emergency protection device in the embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of a standby shaking furnace system in the AOD furnace safety emergency protection device in an embodiment of the utility model;

[0026] In the figure: 1. Argon gas supply pipeline; 101. Argon gas inlet valve; 102. Argon gas main pipeline; 103. First cooling gas branch; 104. Second cooling gas branch; 105. Main gun cooling gas flow meter; 106. Main gun cooling gas thermometer; 107. Main gun cooling gas pressure transmitter; 108. Main gun cooling gas regulating valve; 109. Main gun cooling gas outlet valve; 110. Auxiliary gun cooling gas flow meter; 111. Auxiliary gun cooling gas thermometer; 112. Auxiliary gun cooling gas pressure transmitter; 113. Auxiliary gun cooling gas regulating valve; 114. Auxiliary gun cooling gas outlet valve; 2. Nitrogen gas supply pipeline; 201. Nitrogen inlet valve; 3. Accident gas pipeline; 301. First branch ; 302, the second branch; 303, the accident gas control valve; 4, the cleaning air pipeline; 401, the cleaning air inlet valve; 5, the compressed air pipeline; 501, the compressed air intake valve; 6, the emergency furnace shaking control valve; 7, the brake cylinder; 8, the pneumatic motor; 9, the double-axis reducer; 10, the furnace shaking motor; 11, the AOD furnace; 12, the main gun air intake pipe; 13, the auxiliary gun air intake pipe; 14, the one-way valve; 15, the oxygen supply pipeline; 1501, the main gun oxygen inlet valve; 1502, the main gun oxygen flow meter; 1503, the main gun oxygen thermometer; 1504, the main gun oxygen pressure transmitter; 1505, the main gun oxygen regulating valve; 1506, the main gun oxygen outlet valve. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that, in the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, it should be understood that for the convenience of description, the sizes of various components shown in the drawings are not drawn according to the actual proportional relationship.

[0030] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not need to be further discussed and described in detail in the description of the subsequent drawings.

[0031] Example:

[0032] like Figure 1 and Figure 2 The AOD furnace safety emergency protection device shown comprises:

[0033] An argon gas supply pipeline 1, the argon gas supply pipeline 1 is connected to a main gun gas inlet pipe 12 and a secondary gun gas inlet pipe 13 respectively, an argon gas inlet valve 101 for controlling the on-off of the argon gas supply pipeline 1 is installed at the first node of the argon gas supply pipeline 1, the argon gas inlet valve 101 is opened in an energized state to conduct the argon gas supply pipeline 1, and is closed in an unenergized state;

[0034] A nitrogen gas supply pipeline 2, wherein the nitrogen gas supply pipeline 2 is connected to the main gun gas inlet pipe 12 and the auxiliary gun gas inlet pipe 13 respectively, and a nitrogen gas inlet valve 201 for controlling the on-off of the nitrogen gas supply pipeline 2 is installed at the first node of the nitrogen gas supply pipeline 2, and the nitrogen gas inlet valve 201 is opened when powered to conduct the nitrogen gas supply pipeline 1, and is closed when powered off;

[0035] An accident gas pipeline 3, wherein the air inlet end of the accident gas pipeline is connected to the second node of the argon gas supply pipeline 1 so that the accident gas pipeline 3 is conducted with the argon gas supply pipeline 1, and the second node of the argon gas supply pipeline 1 is located between the air inlet end of the argon gas supply pipeline 1 and the first node of the argon gas supply pipeline 1. The first node of the accident gas pipeline 3 is divided into a first branch 301 connected to the main gun air inlet pipe 12 and a second branch 302 connected to the auxiliary gun air inlet pipe 13. An accident gas control valve 303 for controlling the on and off of the accident gas pipeline 3 is installed at the second node of the accident gas pipeline 3. The accident gas control valve 303 is closed when powered on and opened when powered off to conduct the accident gas pipeline 3. The second node of the accident gas pipeline 3 is located between the air inlet end of the accident gas pipeline 3 and the first node of the accident gas pipeline 3. Figure 1 As shown, along the air flow direction, the air inlet end of the accident gas pipeline 3 is located in front of the argon gas inlet valve 101, so the opening and closing of the argon gas inlet valve will not affect the access of argon gas to the accident gas pipeline.

[0036] During production, a UPS uninterruptible power supply is installed. The UPS uninterruptible power supply (backup battery) is used to switch instantly when the mains power is tripped to continue to supply power to the electrical control system. By writing a PLC control program, this device can protect the following emergencies:

[0037] (1) When the city power is cut off or the UPS fails, the argon inlet valve 101 and the nitrogen inlet valve 201 are closed, and the first cooling gas branch 103 and the second cooling gas branch 104 no longer supply cooling gas to the main and auxiliary guns; the accident gas control valve 303 on the accident gas pipeline 3 loses power, and the accident gas ball valve automatically opens to pass argon into the main and auxiliary guns, thereby protecting the main and auxiliary guns.

[0038] (2) If the AC power is normal, the AC power supply will be prioritized; if the AC power is off, the UPS will be switched to the uninterruptible power supply.

[0039] Backup battery operation:

[0040] a. When the AOD furnace exceeds a certain furnace tilt angle and the cooling gas is not opened in time, the accident gas control valve can be opened automatically in time to input argon gas into the main gun and the auxiliary gun to continue to protect the equipment; b. When the AOD furnace exceeds a certain furnace tilt angle and the main gun outlet pressure is insufficient or the cooling gas pressure is insufficient, the accident gas control valve can be opened automatically to protect the equipment. By setting the AOD furnace safety emergency protection device of the utility model, the automatic emergency handling rate of the AOD furnace when encountering sudden abnormal situations is increased to 100%, and the personal and equipment accident rate is reduced to zero.

[0041] like Figure 3As shown, the device also includes a backup furnace shaking system, which includes a compressed air pipeline 5, an emergency furnace shaking control valve 6, a brake cylinder 7, an air motor 8 and a double-shaft reducer 9; the compressed air pipeline 5 is equipped with a compressed air intake valve 501 for controlling the opening and closing of the compressed air pipeline 5; the compressed air pipeline 5 supplies air to the brake cylinder 7 and the air motor 8, and when the compressed air intake valve 501 is powered, the compressed air pipeline 5 is connected, and when the emergency furnace shaking control valve 6 is powered, the brake cylinder 7 is controlled to open the brake of the reducer brake wheel, and the air is supplied to the air motor 8, thereby driving the furnace shaking device to work and shaking the furnace body to a safe state; when the emergency furnace shaking control valve 6 is de-energized, the brake cylinder 7 is controlled to cancel the opening action of the brake wheel of the reducer, and the air motor stops working. The first input shaft of the double-shaft reducer 9 is connected to the furnace shaking motor 10, the second input shaft of the double-shaft reducer 9 is connected to the air motor 8, and the output end of the double-shaft reducer 9 is connected to the furnace tilting device. When the AOD furnace is powered by the mains, the backup furnace shaking system is powered by the mains; when the mains is out of power, the backup furnace shaking system switches to the UPS uninterruptible power supply to continue supplying power. When the AOD furnace fails or a sudden power outage causes the furnace shaking motor to fail to work, the compressed air intake valve and the emergency furnace shaking control valve can be manually opened to connect the compressed air pipeline, drive the pneumatic motor to work, and shake the furnace body to a safe state. A backup furnace shaking system is set up to shake the furnace body to a safe state in an emergency. If the failure is short-term, you can wait for recovery to continue smelting; if it is long-term, the molten steel in the furnace can be poured out and wait for production plan to minimize the loss.

[0042] The utility model also includes a purge air pipeline 4, the first node of the purge air pipeline 4 is equipped with a purge air inlet valve 401 for controlling the on and off of the purge air pipeline, the purge air inlet valve 401 is manually controlled, opened in the power-on state to conduct the purge air pipeline 4, and closed in the power-off state; the second node of the purge air pipeline 4 is connected to the first node of the accident air pipeline 3, so that the purge air pipeline 4 is conducted with the main gun air inlet pipe 12 through the first branch 301, and is conducted with the auxiliary gun air inlet pipe 13 through the second branch 302, and the first node of the purge air pipeline 4 is located between the air inlet end of the purge air pipeline 4 and the second node of the purge air pipeline 4. After the smelting is completed, the purge air inlet valve 401 can be manually opened to purge the main gun and the auxiliary gun and the corresponding pipelines. Connecting the purge air pipeline 4 to the accident air pipeline 3, and connecting the purge air pipeline 4 to the main gun and the auxiliary gun through the branch of the accident air pipeline simplifies the pipeline design and saves installation space. During the smelting process, the purge air inlet valve 401 is in a normally closed state and is only manually opened when the smelting is completed and the main and auxiliary guns need to be cleaned, while the accident air control valve 303 is automatically opened in an emergency. Therefore, although the accident air pipeline 3 and the purge air pipeline 4 are interconnected, their working states and control methods are different, so they will not interfere with each other, ensuring the safety and stability of the smelting process.

[0043] The accident gas control valve 303 includes a ball valve and a control solenoid valve; the ball valve is located at the second node of the accident gas pipeline 3, and the control solenoid valve is connected to the ball valve to control the opening and closing of the ball valve. The accident gas control valve 303 adopts a combined design of a ball valve and a control solenoid valve to improve the working stability of the valve body. Figure 2 As shown, one end of the power supply of the accident gas control solenoid valve coil is connected to 0V, and the other end is connected to the normally open point of the intermediate relay. The corresponding normally open point of the intermediate relay is then connected to the 24V provided by the external mains. The intermediate relay coil is controlled by the PLC. Through programming, under normal circumstances, the intermediate relay coil remains in the energized state with the output of the PLC module, and the normally open point of the intermediate relay becomes a normally closed point. When the external mains maintains a 24V power supply, the accident gas control solenoid valve coil is energized, and the accident ball valve is closed; only when the 24V power supply provided by the external mains is disconnected or the intermediate relay coil loses power, the accident gas control solenoid valve coil loses power, the accident ball valve is open, and argon flows into the main gun and the auxiliary gun through the accident gas pipeline.

[0044] The argon gas supply pipeline 1 includes an argon gas main pipeline 102, a first cooling gas branch 103, and a second cooling gas branch 104. The first node and the second node of the argon gas supply pipeline 1 are both located in the argon gas main pipeline 102. The argon gas main pipeline 102 is connected to the main gun air inlet pipe 12 through the first cooling gas branch 103, and the argon gas main pipeline 102 is connected to the auxiliary gun air inlet pipe 13 through the second cooling gas branch 104. By designing a branch for the argon gas supply pipeline 1, cooling gas is supplied to the main and auxiliary guns at the same time.

[0045] Among them, the main gun cooling gas flow meter 105, the main gun cooling gas thermometer 106, the main gun cooling gas pressure transmitter 107, the main gun cooling gas regulating valve 108 and the main gun cooling gas outlet valve 109 are sequentially installed on the first cooling gas branch 103 along the airflow direction. The auxiliary gun cooling gas flow meter 110, the auxiliary gun cooling gas thermometer 111, the auxiliary gun cooling gas pressure transmitter 112, the auxiliary gun cooling gas regulating valve 113 and the auxiliary gun cooling gas outlet valve 114 are sequentially installed on the second cooling gas branch 104 along the airflow direction. Through the above settings, other temperatures, pressures, etc. in the first cooling gas branch 103 and the second cooling gas branch 104 can be monitored at any time to ensure stable production and safe operation.

[0046] The nitrogen gas supply pipeline 2 is connected to the third node of the argon gas main pipeline 102, and is connected to the main gun air intake pipe 12 through the first cooling gas branch 103, and is connected to the auxiliary gun air intake pipe 13 through the second cooling gas branch 104. The third node of the argon gas main pipeline 103 is located between the second node of the argon gas supply pipeline 1 and the first cooling gas branch 103. The nitrogen gas supply pipeline 2 is connected to the argon gas supply pipeline 1, and the first cooling gas branch 103 and the second cooling gas branch 104 of the nitrogen gas supply pipeline 2 are used to provide cooling gas for the main and auxiliary, which simplifies the pipeline design and saves installation space. Along the airflow direction, the third connection point of the argon gas main pipeline 102 is located behind the argon gas inlet valve, which will not affect the normal operation of the accident gas pipeline and the argon gas supply pipeline.

[0047] It also includes an oxygen supply pipeline 15, which is connected to the main gun air inlet pipe 12. The oxygen supply pipeline 15 is sequentially installed with a main gun oxygen inlet valve 1501, a main gun oxygen flow meter 1502, a main gun oxygen thermometer 1503, a main gun oxygen pressure transmitter 1504, a main gun oxygen regulating valve 1505 and a main gun oxygen outlet valve 1506 along the air flow direction. The oxygen supply pipeline 15 is set to supply oxygen to the AOD furnace 11. The oxygen supply pipeline 15 is provided with a valve body, a thermometer, a pressure gauge, etc., which is convenient for monitoring and adjusting the oxygen supply to ensure safe and stable production.

[0048] The oxygen supply pipeline 15 is near the main gun air inlet pipe, the first branch 301 is near the main gun air inlet pipe, the first cooling air branch 103 is near the main gun air inlet pipe, the second cooling air branch 104 is near the auxiliary gun air inlet pipe, the second branch 302 is near the auxiliary gun air inlet pipe, and the compressed air pipeline 5 is near the brake cylinder. The check valve is a fireproof check valve, which can prevent gas backflow and protect the pipeline to prevent the high-temperature hot gas in the AOD furnace 11 from damaging the gas supply pipeline.

[0049] In the present invention, a UPS uninterruptible power supply is installed, and the backup power supply is switched instantly in the event of a city power outage to supply power to the electrical control system. Combined with PLC program control, the following effects are achieved: (1) When the city power is cut off or the UPS uninterruptible power supply fails, the argon inlet valve 101 and the nitrogen inlet valve 201 are closed, and the first cooling gas branch 103 and the second cooling gas branch 104 no longer pass cooling gas into the main and auxiliary guns; the accident gas control valve 303 on the accident gas pipeline 3 loses power, and the accident gas ball valve automatically opens to pass argon into the main gun and the auxiliary gun, thereby protecting the main gun and the auxiliary gun.

[0050] (2) If the AC power is normal, the AC power supply will be given priority; if the AC power is off, the system will switch to the UPS uninterruptible power supply backup battery for power supply:

[0051] a. When the AOD furnace exceeds a certain furnace tilt angle and the cooling gas is not opened in time, the accident gas control valve can be automatically opened in time to input argon gas into the main gun and the auxiliary gun to continue to protect the equipment; b. When the AOD furnace exceeds a certain furnace tilt angle, and the main gun outlet pressure is insufficient or the cooling gas pressure is insufficient, the accident gas control valve can be automatically opened to protect the equipment; c. When the AOD furnace has an equipment failure, manually open the compressed air intake valve and the emergency furnace shaking control valve, and the compressed air supplies the pneumatic motor to work. In an emergency, the furnace body can be shaken to a safe state. The above settings can greatly reduce the impact of equipment accidents on equipment and production, and can also make up for human operational errors. In the event of an emergency, the loss can be minimized, ensuring the entire production rhythm and the stability of equipment operation.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An AOD furnace safety emergency protection device, characterized in that: include: An argon gas supply pipeline, the argon gas supply pipeline is connected to the main gun air inlet pipe and the auxiliary gun air inlet pipe respectively, an argon gas inlet valve for controlling the on-off of the argon gas supply pipeline is installed at the first node of the argon gas supply pipeline, the argon gas inlet valve is opened in an energized state to conduct the argon gas supply pipeline, and is closed in a de-energized state; A nitrogen gas supply pipeline, the nitrogen gas supply pipeline is connected to the main gun gas inlet pipe and the auxiliary gun gas inlet pipe respectively, a nitrogen gas inlet valve for controlling the on-off of the nitrogen gas supply pipeline is installed at the first node of the nitrogen gas supply pipeline, the nitrogen gas inlet valve is opened in an energized state to conduct the nitrogen gas supply pipeline, and is closed in an unenergized state; An accident gas pipeline, wherein the air inlet end of the accident gas pipeline is connected to the second node of the argon gas supply pipeline to make the accident gas pipeline and the argon gas supply pipeline conduct. The second node of the argon gas supply pipeline is located between the air inlet end of the argon gas supply pipeline and the first node of the argon gas supply pipeline. The first node of the accident gas pipeline is divided into a first branch connected to the main gun air inlet pipe and a second branch connected to the auxiliary gun air inlet pipe. An accident gas control valve for controlling the on and off of the accident gas pipeline is installed at the second node of the accident gas pipeline. The accident gas control valve is closed when powered on and opened when powered off to conduct the accident gas pipeline. The second node of the accident gas pipeline is located between the air inlet end of the accident gas pipeline and the first node of the accident gas pipeline.

2. The AOD furnace safety emergency protection device according to claim 1 is characterized in that: It also includes a purge air pipeline, a first node of the purge air pipeline is equipped with a purge air inlet valve for controlling the on and off of the purge air pipeline, the purge air inlet valve is opened when powered on to conduct the purge air pipeline, and is closed when powered off; the second node of the purge air pipeline is connected to the first node of the accident air pipeline, so that the purge air pipeline is connected to the main gun air intake pipe through the first branch, and is connected to the auxiliary gun air intake pipe through the second branch, and the first node of the purge air pipeline is located between the air intake end of the purge air pipeline and the second node of the purge air pipeline.

3. The AOD furnace safety emergency protection device according to claim 1 is characterized in that: It also includes a backup furnace shaking system, which includes a compressed air pipeline, an emergency furnace shaking control valve, a brake cylinder, a pneumatic motor and a double-axis reducer; the compressed air pipeline supplies air to the brake cylinder and the pneumatic motor through the emergency furnace shaking control valve, and the emergency furnace shaking control valve is used to control the brake cylinder to move when it is powered on and drive the pneumatic motor to run; the emergency furnace shaking control valve is used to control the brake cylinder to cancel the action when it is de-energized, the first input shaft of the double-axis reducer is connected to the furnace shaking motor, the second input shaft of the double-axis reducer is connected to the pneumatic motor, and the output end of the double-axis reducer is connected to the furnace tilting device.

4. The AOD furnace safety emergency protection device according to claim 3 is characterized in that: The compressed air pipeline is installed with a compressed air intake valve for controlling the on-off of the compressed air pipeline.

5. The AOD furnace safety emergency protection device according to claim 1 is characterized in that: The accident gas control valve comprises a ball valve and a control solenoid valve; the ball valve is located at the second node of the accident gas pipeline, and the control solenoid valve is connected to the ball valve to control the opening and closing of the ball valve.

6. The AOD furnace safety emergency protection device according to claim 5 is characterized in that: The argon gas supply pipeline includes an argon gas main pipeline, a first cooling gas branch and a second cooling gas branch. The first node and the second node of the argon gas supply pipeline are both located in the argon gas main pipeline. The argon gas main pipeline is connected to the main gun air inlet pipe through the first cooling gas branch, and the argon gas main pipeline is connected to the auxiliary gun air inlet pipe through the second cooling gas branch.

7. The AOD furnace safety emergency protection device according to claim 6 is characterized in that: It also includes a main gun cooling air flow meter, a main gun cooling air thermometer, a main gun cooling air pressure transmitter, a main gun cooling air regulating valve and a main gun cooling air outlet valve; the main gun cooling air flow meter, main gun cooling air thermometer, main gun cooling air pressure transmitter, main gun cooling air regulating valve and main gun cooling air outlet valve are installed in sequence on the first cooling air branch along the air flow direction.

8. The AOD furnace safety emergency protection device according to claim 6 is characterized in that: It also includes a secondary gun cooling air flow meter, a secondary gun cooling air thermometer, a secondary gun cooling air pressure transmitter, a secondary gun cooling air regulating valve, and a secondary gun cooling air outlet valve; the secondary gun cooling air flow meter, secondary gun cooling air thermometer, secondary gun cooling air pressure transmitter, secondary gun cooling air regulating valve, and secondary gun cooling air outlet valve are installed in the second cooling air branch in sequence along the air flow direction.

9. The AOD furnace safety emergency protection device according to claim 6, characterized in that: The nitrogen gas supply pipeline is connected to the third node of the argon gas main pipeline, and is connected to the main gun air inlet pipe through the first cooling gas branch, and is connected to the auxiliary gun air inlet pipe through the second cooling gas branch. The third node of the argon gas main pipeline is located between the second node of the argon gas supply pipeline and the first cooling gas branch.

10. The AOD furnace safety emergency protection device according to claim 9, characterized in that: It also includes an oxygen supply pipeline, which is connected to the main gun air inlet pipe. The oxygen supply pipeline is equipped with a main gun oxygen inlet valve, a main gun oxygen flow meter, a main gun oxygen thermometer, a main gun oxygen pressure transmitter, a main gun oxygen regulating valve and a main gun oxygen outlet valve in sequence along the airflow direction.

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