Automatic ignition method and system applied to hot-metal ladle scrap steel baking device

Abstract

The invention discloses an automatic ignition method and system applied to a hot-metal ladle scrap steel baking device, and belongs to the technical field of steel smelting, and the automatic ignition method comprises the steps that a power source of the hot-metal ladle scrap steel baking device is started; power is supplied based on a power source of the hot-metal ladle scrap steel baking device, and a low-pressure baking-hot rod arranged in the hot-metal ladle scrap steel baking device is preheated by igniting a high-temperature-resistant cable; when preheating of the low-pressure baking-hot rod is completed and a preset ignition condition is met, a fuel gas supply mechanism and a compressed air mechanism of the hot-metal ladle scrap steel baking device are triggered to convey fuel gas and compressed air to an ignition area correspondingly, and combustible mixed gas is formed; and high-pressure sparks generated by the ignition burner act on the surface of the low-pressure searing rod to ignite the combustible mixed gas, so that automatic ignition of the hot-metal ladle scrap steel baking device is realized. Rapid and uniform heating is achieved, energy consumption caused by long open fire is reduced, the baking efficiency is improved, field manual operation is reduced, the operation risk is reduced, and the safety of overall operation is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel smelting, and in particular relates to an automatic ignition method and system applied to a scrap steel baking device in a molten iron tank. Background Art

[0002] During the steelmaking process, scrap steel added to the molten iron ladle requires pre-baking to raise its temperature, improve the iron-to-steel ratio, and reduce the amount of molten iron loaded, significantly reducing smelting costs. Traditional scrap baking methods rely on manual ignition. A fire source is introduced, and a spark rod is used to ignite a constant flame. Once the constant flame is lit, gas is introduced for heating. This is not only inefficient but also poses safety risks in areas with surrounding gas. Other ignition methods currently available in the industry include gas jets and electronic ignition. However, these methods perform poorly in low temperatures and high winds, are prone to extinguishing, and require multiple ignitions, resulting in poor safety. Furthermore, once ignited, the flame remains persistent and difficult to shut down. This consumes significant amounts of energy (gas, oxygen, etc.) during non-baking periods, resulting in energy waste.

[0003] In the prior art, Chinese patent CN108397784A published on August 14, 2018 discloses a blast furnace gas ignition and dispersion system, which adopts a high-altitude ignition and burning device and a catalytic reaction chamber, and realizes automatic ignition and burning through an elevator arc generating device. The ignition efficiency is not high, and it is easy to cause ignition failure; in addition, Chinese patent CN113774185A published on December 10, 2021 discloses a scrap steel hopper baking device and method based on automatic ignition and gas explosion protection, which realizes automatic flame monitoring and rapid cut-off of fuel supply, but does not take into account the energy consumption caused by the long-lasting flame, and the overall baking efficiency is not high. Summary of the Invention

[0004] The present invention aims to address the problems of low manual ignition efficiency, high safety risks, and easy extinguishing, requiring repeated on-site operations, in scrap steel baking devices for hot metal ladle. The present invention provides an automatic ignition method and system for use in scrap steel baking devices for hot metal ladle. This method solves the problems of low manual ignition efficiency, high safety risks, and easy extinguishing, requiring repeated on-site operations, thereby achieving rapid and uniform heating, reducing energy consumption caused by continuous flames, and improving baking efficiency. It also reduces on-site manual operations, lowers operational risks, and improves overall operational safety.

[0005] According to one aspect of the present specification, there is provided an automatic ignition method for a scrap steel baking device in a molten iron ladle, comprising: Start the power supply of the scrap steel baking device in the hot metal ladle; Based on the power supply of the scrap steel drying device of the hot metal ladle, the low-voltage heating rod built into the scrap steel drying device of the hot metal ladle is preheated by igniting the high-temperature resistant cable; When the low-pressure heating rod is preheated and reaches the preset ignition condition, the gas supply mechanism and compressed air mechanism of the scrap steel baking device of the molten iron ladle are triggered to deliver gas and compressed air to the ignition area respectively, forming a combustible mixed gas; An ignition burner is used to generate high-pressure sparks that act on the surface of a low-pressure heating rod to ignite the combustible mixed gas, thereby achieving automatic ignition of the scrap steel baking device in the molten iron ladle.

[0006] Furthermore, the working process of completing the preheating of the low-pressure heating rod and reaching the preset ignition conditions includes: In the early stage of ignition, the heating power is adjusted by temperature control so that the low-pressure heating rod reaches the reference temperature within the set time; After the low-pressure heating rod reaches the reference temperature, it enters the ignition window period and waits for the preset time, triggering the gas supply mechanism and the compressed air mechanism to deliver gas to the ignition area for the low-pressure heating rod to ignite.

[0007] Furthermore, the method further includes: If ignition fails for a set number of consecutive times using the low-voltage heating rod within the ignition window, the system switches to the backup high-voltage discharge ignition mode.

[0008] Furthermore, in the standby high-voltage discharge ignition mode, the electrode spacing is dynamically adjusted according to the air flow rate.

[0009] Furthermore, the gas is delivered to the ignition area through the gas supply mechanism and the compressed air mechanism, including: The gas supply mechanism adjusts the valve opening according to the preset gas flow parameters and delivers the gas to the ignition area; at the same time, the compressed air mechanism compresses the air through the pressure reducing valve and delivers the compressed air to the ignition area; The fuel gas and compressed air are mixed in the ignition area to form a combustible mixture.

[0010] Furthermore, the method further includes: performing flame verification on the high-voltage spark in sequence, including: detecting the initial ignition flame, detecting the temperature gradient of the combustion chamber, and identifying the flame shape.

[0011] Furthermore, flame verification is carried out in sequence, including: When the initial pilot flame and combustion chamber temperature gradient are detected to be abnormal, the gas supply and power supply are shut off and an audible and visual alarm is sounded.

[0012] According to one aspect of this specification, there is provided an automatic ignition system for a scrap steel baking device in a molten iron ladle, comprising: Ignition high-temperature resistant cable, connected to the power supply, transmits electrical energy to the low-voltage heating rod built into the scrap steel baking device of the molten iron ladle for preheating; The low-pressure hot rod is arranged in the scrap steel baking device, and receives electric energy through a high-temperature-resistant cable to preheat. The gas supply mechanism is connected with the ignition area, and sends the gas to the ignition area when the low-pressure hot rod reaches the preset ignition condition. The compressed air mechanism is connected with the ignition area, and sends the compressed air to the ignition area when the low-pressure hot rod reaches the preset ignition condition. The ignition burner generates high-voltage sparks, and applies the high-voltage sparks to the surface of the preheated low-pressure hot rod to ignite the combustible mixed gas after the gas and the compressed air are mixed.

[0013] Further, the gas supply mechanism comprises: The gas manual valve is used to close the gas supply during maintenance; The gas pneumatic ball valve is used to reduce the gas pressure before ignition; The pressure reducing valve is used to stabilize the pressure of the gas.

[0014] Further, the compressed air mechanism comprises: The compressed air manual valve is used to control the supply of the compressed air; The compressed air pneumatic ball valve is used to increase the air flow to a set value after the high-voltage sparks are stabilized; The pressure reducing valve is used to stabilize the pressure of the compressed air.

[0015] Compared with the prior art, the present application has the following advantages: 1. The present application solves the problems of low efficiency, high safety risk, easy to extinguish and the need for repeated operation on site, etc. of manual ignition of the scrap steel baking device, realizes rapid and uniform heating, reduces energy consumption caused by long-lasting fire, improves baking efficiency, reduces on-site manual operation, reduces operation risk, and improves the safety of the whole operation.

[0016] 2. The present application realizes automatic ignition through the low-pressure hot rod and low-pressure technology, significantly improves the ignition success rate, improves the reliability and safety of ignition, and the low-pressure hot rod pays more attention to energy saving and high efficiency in design and use. Through accurate control of the ignition process, energy waste is reduced.

[0017] 3. The automatic ignition operation of the low-pressure hot rod proposed in the present application has strong adaptability to fuels and working conditions, can cope with different types of scrap steel and baking requirements, and ensures the baking quality and production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a method flowchart of an embodiment of the present application; Figure 2 The figure is a schematic diagram of the automatic ignition program operation of an embodiment of the present application; Figure 3 Schematic diagram of the structure of an embodiment of the present invention.

[0019] In the figure: 1. 24V power supply; 2. Ignition high-temperature resistant cable; 3. Low-voltage heating rod; 4. Gas supply mechanism; 5. Compressed air mechanism; 6. Ignition burner; 11. Scrap baking device for molten iron ladle. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and 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. Therefore, they cannot be understood as limiting the present invention.

[0022] like Figure 1 As shown, an embodiment of the present invention provides an automatic ignition method applied to a scrap steel baking device 11 of a molten iron ladle, comprising: starting the power supply of the scrap steel baking device 11 of the molten iron ladle; based on the power supply of the scrap steel baking device 11 of the molten iron ladle, preheating the low-pressure heating rod 3 built into the scrap steel baking device 11 of the molten iron ladle through the ignition high-temperature resistant cable 2; when the preheating of the low-pressure heating rod 3 is completed and the preset ignition conditions are reached, the gas supply mechanism 4 and the compressed air mechanism 5 of the scrap steel baking device 11 of the molten iron ladle are triggered to respectively deliver gas and compressed air to the ignition area to form a combustible mixed gas; using the ignition burner 6 to generate a high-pressure spark acting on the surface of the low-pressure heating rod 3 to ignite the combustible mixed gas, thereby realizing automatic ignition of the scrap steel baking device 11 of the molten iron ladle.

[0023] Specifically, an embodiment of the present invention also provides a structural composition in the automatic ignition process, which consists of a low-voltage heating rod 3, an ignition burner 6, a 24V power supply 1, a gas pipeline, a gas manual valve, a gas pneumatic ball valve, a compressed air pipeline, a compressed air manual valve, a compressed air pneumatic ball valve, a compressed air pressure reducing valve, and an ignition high-temperature resistant cable 2.

[0024] Specifically, the gas supply mechanism 4 is mainly composed of key components such as a gas pipeline, a manual valve, a pneumatic ball valve and a pressure reducing valve. The manual valve uses a DN50 stainless steel ball valve, which has a normally open characteristic and remains open when the equipment is operating normally so that the gas can pass smoothly. When equipment maintenance is required, the operator can manually close the valve to isolate the gas supply mechanism 4 from subsequent equipment to ensure the safe progress of the maintenance work. The pneumatic ball valve has a position feedback function that can provide real-time feedback on the valve's switching status. It receives the control signal from the control module to achieve automatic on-off control. The pressure reducing valve is used to adjust the gas pressure to ensure that the supplied gas pressure meets the operating requirements of the baking device.

[0025] During the gas supply process, the manual valve is initially kept open. Thirty seconds before ignition, the pressure reducing valve begins operation, precisely reducing the gas pressure to 0.05 MPa, ensuring optimal pressure conditions for subsequent ignition and combustion. Subsequently, the pneumatic ball valve, under the control of the control module, opens, increasing the gas flow rate to 5 m³ / min and maintaining this flow rate for a period of time to meet scrap roasting requirements.

[0026] Specifically, the compressed air mechanism 5 is mainly composed of air pipes, manual valves, pneumatic ball valves and pressure reducing valves. The air pipe serves as a conveying channel for compressed air, ensuring that the air can smoothly reach various gas consumption points. The manual valve adopts DN40 specifications and remains in a normally open state when the equipment is operating normally so that compressed air can pass normally. When it is necessary to inspect and repair the air pipe or related equipment, the operator can manually close the valve to isolate the compressed air supply system from subsequent equipment to ensure the safe progress of the inspection and maintenance work. The pneumatic ball valve is a key component for controlling the on and off of compressed air. It receives the control signal from the control module and realizes automatic operation. The pressure reducing valve plays the role of stabilizing the pressure, ensuring that the compressed air pressure supplied to the pneumatic actuator is stable within an appropriate range, and providing a reliable power source for the normal operation of the pneumatic valve.

[0027] During the compressed air process, the air supply pressure to the pneumatic actuator is set at 0.6 MPa ± 0.05. When the system receives the ignition command, it opens the air valve 2 seconds in advance, allowing compressed air to enter the pneumatic actuator in preparation for subsequent valve actuation. Once the flame reaches a stable state, the air flow rate is increased to 10 m³ / min to ensure stable operation of the pneumatic valve and the overall operation of the system.

[0028] Specifically, the present invention provides a detailed automatic ignition process. This automatic ignition system features two operating modes: a main mode (low-pressure heating rod 3) and a backup mode (high-voltage discharge), ensuring stable and reliable ignition in all environments. When the ignition process is initiated, the system first enters the main mode, namely, the ignition mode for the low-pressure heating rod 3. The low-pressure heating rod 3 is made of nickel-chromium alloy, and its surface temperature is set to 1.5 times the ignition temperature of coal gas. During the initial ignition phase, the PID temperature control system quickly intervenes, precisely adjusting the heating power to ensure that the low-pressure heating rod 3 reaches the preset ignition conditions, reaching a reference temperature of 800°C within 3 seconds. The temperature response time is no more than 10 seconds, ensuring timely preparation for subsequent ignition. Once the low-pressure heating rod 3 reaches the target temperature, the system enters the ignition window. Within 5-8 seconds after reaching the target temperature, the system delivers gas and compressed air through the gas and compressed air mechanisms to form a combustible gas mixture. The ignition burner then acts on the surface of the low-pressure heating rod, igniting the combustible gas mixture. If ignition is successful, a flame establishment signal is fed back to the system, and the ignition process is successfully completed. However, if the low-voltage hot rod fails to ignite three times in a row within the ignition window, the system automatically determines that the primary mode has failed and quickly switches to the backup mode. The backup mode is high-voltage discharge ignition. In backup mode, the electrode spacing is dynamically adjusted based on air flow. This self-regulating mechanism optimizes the arc discharge effect according to actual operating conditions and improves the ignition success rate. Once the flame establishment signal is fed back, the system immediately stops discharge, avoiding unnecessary energy consumption and equipment damage.

[0029] Specifically, throughout the automatic ignition process, the dual-mode ignition unit seamlessly switches between primary and backup modes, leveraging the advantages of both ignition methods. The primary mode utilizes the radiant heat from the low-pressure glow rod 3 to ignite the gas, offering stable ignition and strong environmental adaptability. The backup mode provides a reliable backup in the event of a primary mode failure, ensuring ignition success under any circumstances. This dual-mode design significantly improves the reliability and stability of the ignition system, providing a strong guarantee for the normal operation of gas equipment.

[0030] Specifically, the embodiment of the present application also provides a safety interlock workflow. After the device starts ignition, the safety interlock module sequentially performs three-stage flame verification. First, the ultraviolet sensor rapidly detects the initial ignition flame within <100 ms, and at the same time, the K-type thermocouple starts to monitor the temperature gradient of the combustion chamber. When the combustion is normal, the K-type thermocouple transmits the temperature data to the control system in real time to determine whether the combustion is in a stable state. The infrared vision system uses an infrared camera to perform pattern recognition on the flame shape, and when the flame occupies >60% in the ROI (region of interest), it is determined that the flame shape is normal. If two of the three stages of detection are abnormal during combustion, the emergency shutdown logic is immediately started. The emergency shutdown system responds quickly, and the shutdown protection response time is ≤3 seconds, which is 60% higher than the prior art, and can cut off the gas supply in the shortest time to prevent the accident from further expanding. After triggering the emergency shutdown, the system enters the post-shutdown retry mechanism. The system will make up to 3 ignition attempts, with an interval of 20 seconds between each attempt. In addition, the safety interlock module also has an alarm linkage function. When an abnormal situation occurs, the audible and visual alarm will sound to remind the on-site personnel. At the same time, the system will remotely push the fault code to the terminal device of the relevant personnel to understand the fault situation in time and take appropriate handling measures.

[0031] Specifically, the embodiment of the present application also provides a working process of the intelligent control module. Taking the PLC control system as the core, it has two operation modes, automatic mode and manual mode, and can flexibly control the operation of the baking equipment according to different needs. Figure 2 As shown in the figure, first, the preheating program is executed, the PLC controls the heating rod to start heating, and at the same time, the air purging function is started to remove the residual gas or impurities that may exist in the combustion chamber, creating a safe environment for subsequent ignition. After preheating is completed, the system automatically opens the gas valve and starts the ignition program according to the preset ignition sequence. During the ignition process, the three-stage flame verification system of the safety interlock module works synchronously, and the ultraviolet sensor, K-type thermocouple and infrared vision system detect the flame from different dimensions respectively. Only when all three stages of flame verification pass, the system will determine that the ignition is successful, and then start the main burner to make the device enter the normal baking state. Subsequently, the PLC control system switches to the PID temperature closed-loop control mode, and adjusts the gas flow and air ratio in real time according to the set temperature value to ensure that the temperature in the combustion chamber is stable within the target range and ensure the baking quality.

[0032] Specifically, the manual mode is suitable for special circumstances or the equipment debugging stage. The operator must first confirm the interlock release, and this operation requires secondary authority to ensure the safety of the operation. After confirming the release of the interlock, the operator can force the hot rod to open for preheating. During the preheating process of the hot rod, the operator needs to manually confirm the flame status and judge whether the flame is normal by observing the color, shape and other characteristics of the flame. The manual mode has a time-limited operation function with a maximum operation time of 5 minutes to prevent the operator from causing the equipment to be in an abnormal state for a long time due to misoperation or negligence. If the operation is completed within 5 minutes and the equipment is operating normally, it can be switched back to automatic mode to continue operation; if an abnormal situation occurs, appropriate measures must be taken in time to deal with it.

[0033] Specifically, the embodiment of the present invention also provides specific working steps, such as Figure 3 As shown, the 24V power supply 1 of the scrap iron ladle drying device 11 is activated. Based on the power supply of the scrap iron ladle drying device 11, the low-pressure heating rod 3 built into the scrap iron ladle drying device 11 is preheated to a high temperature via the ignition high-temperature resistant cable 2. When the preset ignition conditions are met, the gas supply mechanism 4 and compressed air mechanism 5 of the scrap iron ladle drying device 11 are simultaneously triggered. The gas supply mechanism 4 delivers gas (blast furnace gas, coke oven gas, oxygen, etc.) to the ignition area, and the compressed air mechanism 5 delivers compressed air to the ignition area to form a combustible gas mixture. The ignition burner 6 generates a high-voltage spark, which acts on the surface of the preheated low-pressure heating rod 3, igniting the combustible gas mixture and achieving automatic ignition of the scrap iron ladle drying device 11. Simultaneously, a safety protection device monitors the system's operating status to ensure that timely measures are taken in the event of an abnormality, such as shutting off the gas supply and power supply, to ensure safe system operation.

[0034] To ensure safety during the baking process, a comprehensive safety control system is in place. For example, an ion signal collector monitors the flame of the cover in real time. Once the flame goes out, the supply of combustion-supporting gases such as coal gas and oxygen is immediately shut off to prevent gas leakage and potential safety hazards. Multiple alarms are also installed around the perimeter to alert operators to any abnormalities and evacuate the danger zone.

[0035] Specifically, electrode materials are usually made of tungsten, platinum and other materials. These materials are resistant to high temperatures, not easily oxidized, have good conductivity, and can ensure the stability and continuity of the arc.

[0036] Specifically, the scrap steel baking device involved in the embodiment of the present invention has significant innovations compared to traditional methods, which are described in detail below through specific embodiments.

[0037] Traditional scrap steel roasting devices mostly use manual or spark ignition. Manual ignition is inefficient and poses safety risks, while spark ignition has a success rate of approximately 60%. The present invention's automatic ignition system for the low-pressure heating rod 3 utilizes low-voltage technology to achieve automatic ignition. Upon receiving the ignition command, the PLC control system precisely controls the heating power of the low-pressure heating rod 3, ensuring it reaches a reference temperature of 800°C within 3 seconds. The system then releases the gas within 5-8 seconds of reaching the target temperature, igniting the gas through radiant heat.

[0038] During the ignition process, a PID temperature control algorithm precisely controls the heating power of the low-pressure heating rod 3, ensuring a temperature response time of ≤10 seconds, thus avoiding energy waste caused by overheating. Furthermore, the ignition window is optimized, shortening the gas-on time while ensuring successful ignition, thereby improving baking efficiency. Compared to traditional devices, this system can bake more scrap steel in the same amount of time, while reducing energy consumption by approximately 20%.

[0039] This system is tightly integrated with the intelligent control system, enabling remote monitoring and management. Operators can remotely send commands such as start and stop roasting via a terminal device, and obtain real-time information such as equipment operating status and temperature data. Furthermore, the system features automatic fault diagnosis and alarm functions, reducing the difficulty and risk of manual operation and improving the overall automation level of the equipment. The low-pressure hot rod 3 automatic ignition system is highly adaptable to fuels and operating conditions. Whether using gases of varying calorific values ​​or scrap steel of varying shapes and sizes, the system adjusts ignition parameters and roasting strategies to ensure roasting quality and production efficiency.

[0040] The implementation of each embodiment of the present invention is based on programmed processing performed by a device with processor functionality. Therefore, in practical engineering, the technical solutions and functions of each embodiment of the present invention are packaged into various modules. Based on this reality, and in addition to the aforementioned embodiments, an embodiment of the present invention provides an automatic ignition system for a scrap iron roasting device 11 in a molten iron ladle. This system is used to execute an automatic ignition method for a scrap iron roasting device 11 in the aforementioned method embodiment.

[0041] The system includes: an ignition high-temperature resistant cable 2, which is connected to a power supply to transmit electrical energy to a low-pressure heating rod 3 built into a scrap steel baking device 11 in a molten iron ladle for preheating; a low-pressure heating rod 3, which is arranged in the scrap steel baking device 11 in a molten iron ladle, and receives electrical energy through the ignition high-temperature resistant cable 2 for preheating; a gas supply mechanism 4, which is connected to an ignition area, and delivers gas to the ignition area when the low-pressure heating rod 3 reaches a preset ignition condition; a compressed air mechanism 5, which is connected to the ignition area, and delivers compressed air to the ignition area when the low-pressure heating rod 3 reaches a preset ignition condition; an ignition burner 6, which generates high-pressure sparks, and applies the high-pressure sparks to the surface of the preheated low-pressure heating rod 3 to ignite a combustible mixed gas formed by mixing the gas and compressed air.

[0042] An embodiment of the present invention provides an automatic ignition system for a scrap steel baking device 11 in a molten iron ladle. In the prior art, there are often problems such as low manual ignition efficiency, high safety risks, easy extinguishing and the need for repeated on-site operations in the scrap steel baking device 11 in the molten iron ladle. Several modules are used to achieve rapid and uniform heating, reduce energy consumption caused by long-lasting flames, improve baking efficiency, reduce on-site manual operations, reduce operational risks, improve overall operational safety, and improve ignition reliability and safety. At the same time, the low-pressure heating rod 3 pays more attention to energy saving and efficiency in design and use. By precisely controlling the ignition process, energy waste is reduced, and it can cope with different types of scrap steel and baking requirements, ensuring baking quality and production efficiency.

[0043] Finally, it should be noted that the above specific embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above specific embodiments and is susceptible to numerous variations. Any simple modifications, equivalent variations, and modifications to the above specific embodiments based on the technical essence of the present invention shall be deemed to fall within the scope of protection of the present invention.

Claims

1. An automatic ignition method for a scrap steel baking device in a molten iron ladle, characterized in that: include: Start the power supply of the scrap steel baking device in the hot metal ladle; Based on the power supply of the scrap steel drying device of the hot metal ladle, the low-voltage heating rod built into the scrap steel drying device of the hot metal ladle is preheated by igniting the high-temperature resistant cable; When the low-pressure heating rod is preheated and reaches the preset ignition condition, the gas supply mechanism and compressed air mechanism of the scrap steel baking device of the molten iron ladle are triggered to deliver gas and compressed air to the ignition area respectively, forming a combustible mixed gas; An ignition burner is used to generate high-pressure sparks that act on the surface of a low-pressure heating rod to ignite the combustible mixed gas, thereby achieving automatic ignition of the scrap steel baking device in the molten iron ladle.

2. The automatic ignition method for a scrap steel baking device in a molten iron ladle according to claim 1, characterized in that: The working process of the low-pressure heating rod being preheated and reaching the preset ignition conditions includes: In the early stage of ignition, the heating power is adjusted by temperature control so that the low-pressure heating rod reaches the reference temperature within the set time; After the low-pressure heating rod reaches the reference temperature, it enters the ignition window period and waits for the preset time, triggering the gas supply mechanism and the compressed air mechanism to deliver gas to the ignition area for the low-pressure heating rod to ignite.

3. The automatic ignition method for a scrap steel baking device in a molten iron ladle according to claim 2, characterized in that: The method further comprises: If ignition fails for a set number of consecutive times using the low-voltage heating rod within the ignition window, the system switches to the backup high-voltage discharge ignition mode.

4. The automatic ignition method for a scrap steel baking device in a molten iron ladle according to claim 3, characterized in that: In the standby high-voltage discharge ignition mode, the electrode spacing is dynamically adjusted according to the air flow.

5. The automatic ignition method for a scrap steel baking device in a molten iron ladle according to claim 2, characterized in that: The gas is delivered to the ignition area through the gas supply mechanism and the compressed air mechanism, including: The gas supply mechanism adjusts the valve opening according to the preset gas flow parameters and delivers the gas to the ignition area; at the same time, the compressed air mechanism compresses the air through the pressure reducing valve and delivers the compressed air to the ignition area; The fuel gas and compressed air are mixed in the ignition area to form a combustible mixture.

6. The automatic ignition method for a scrap steel baking device in a molten iron ladle according to claim 1, characterized in that: The method further includes: sequentially performing flame verification on the high-voltage spark, including: detecting an initial ignition flame, detecting a combustion chamber temperature gradient, and identifying a flame morphology.

7. The automatic ignition method for a scrap steel baking device in a molten iron ladle according to claim 6, characterized in that: The flame verification is carried out in sequence and also includes: When the initial pilot flame and combustion chamber temperature gradient are detected to be abnormal, the gas supply and power supply are shut off and an audible and visual alarm is sounded.

8. An automatic ignition system for a scrap steel baking device in a molten iron ladle, characterized in that: include: Ignition high-temperature resistant cable, connected to the power supply, transmits electrical energy to the low-voltage heating rod built into the scrap steel baking device of the molten iron ladle for preheating; The low-voltage heating rod is installed in the scrap steel baking device of the molten iron ladle and receives electricity for preheating through the ignition of high-temperature resistant cables; The gas supply mechanism is connected to the ignition area and supplies gas to the ignition area when the low-pressure heating rod reaches the preset ignition condition; The compressed air mechanism is connected to the ignition area and supplies compressed air to the ignition area when the low-pressure heating rod reaches the preset ignition condition; The ignition burner generates a high-pressure spark, which acts on the surface of the preheated low-pressure hot rod to ignite the combustible mixture of gas and compressed air.

9. The automatic ignition system for a scrap steel baking device in a molten iron ladle according to claim 8, characterized in that: The gas supply mechanism comprises: Gas pneumatic ball valve, used to reduce gas pressure before ignition; Pressure reducing valve, used to stabilize the gas pressure; Gas manual valve, used to shut off the gas supply.

10. The automatic ignition system for a scrap steel baking device in a molten iron ladle according to claim 8, characterized in that: The compressed air mechanism comprises: Compressed air manual valve, used to control the supply of compressed air; Compressed air pneumatic ball valve, used to increase the air flow to the set value after the high-voltage spark is stable; Pressure reducing valve, used to stabilize the pressure of compressed air.

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