CN-122015125-A - Automatic ignition method and system applied to hot metal ladle scrap steel baking device

CN122015125ACN 122015125 ACN122015125 ACN 122015125ACN-122015125-A

Abstract

The invention discloses an automatic ignition method and a system applied to a hot-metal ladle waste steel baking device, belonging to the technical field of steel smelting, comprising a power supply for starting the hot-metal ladle waste steel baking device; the method comprises the steps of preheating a low-voltage hot bar arranged in a hot metal ladle waste steel baking device through an ignition high-temperature-resistant cable based on power supply of the hot metal ladle waste steel baking device, triggering a fuel gas supply mechanism and a compressed air mechanism of the hot metal ladle waste steel baking device to respectively convey fuel gas and compressed air to an ignition area to form combustible mixed gas when the preheating of the low-voltage hot bar is completed and a preset ignition condition is achieved, generating high-voltage sparks on the surface of the low-voltage hot bar by utilizing an ignition burner, igniting the combustible mixed gas, and realizing automatic ignition of the hot metal ladle waste steel baking device. The invention realizes rapid and uniform heating, reduces energy consumption caused by open fire, improves baking efficiency, reduces on-site manual operation, reduces operation risk and improves the safety of integral operation.

Inventors

LUO TAO
ZHANG WEI
YANG YING
CHEN TAO
LIU BINGDE
LUO KAI

Assignees

宝武集团鄂城钢铁有限公司

Dates

Publication Date: 20260512
Application Date: 20260319

Claims (10)

1. An automatic ignition method applied to a hot metal ladle scrap baking device is characterized by comprising the following steps: Starting a power supply of the hot-metal ladle scrap steel baking device; Preheating a low-voltage hot bar arranged in the hot-metal ladle waste steel baking device through an ignition high-temperature-resistant cable based on power supply of the hot-metal ladle waste steel baking device; When the preheating of the low-pressure hot bar is finished and the preset ignition condition is reached, triggering a fuel gas supply mechanism and a compressed air mechanism of the hot metal ladle steel scrap baking device to respectively convey fuel gas and compressed air to an ignition area to form combustible mixed gas; and generating high-pressure sparks on the surface of the preheated low-pressure hot bar by using an ignition burner, and igniting the combustible mixed gas by using the combined energy of the hot surface and the electric spark to realize the automatic ignition of the hot metal ladle scrap baking device.
2. The automatic ignition method for a hot metal ladle scrap baking apparatus according to claim 1, wherein said low-pressure hot bar preheating is completed and reaches a preset ignition condition, comprising: Heating power is regulated and controlled through temperature regulation at the initial stage of ignition, so that the low-voltage hot bar reaches a reference temperature of 800 ℃ within a set time of 3 seconds; After the low-pressure hot bar reaches the reference temperature, the low-pressure hot bar enters an ignition window period of 5-8 seconds and waits for a preset time of 3 seconds, and the gas supply mechanism and the compressed air mechanism are triggered to convey gas to an ignition area so as to ignite the low-pressure hot bar.
3. The automatic ignition method for a hot metal ladle scrap baking apparatus according to claim 2, further comprising: if the ignition fails for 3 continuous times through the low-voltage hot rod in the ignition window period, the standby high-voltage discharge ignition mode is switched.
4. An auto-ignition method for a hot metal ladle scrap baking apparatus in accordance with claim 3 wherein the electrode spacing is dynamically adjusted in accordance with the air flow rate in a standby high voltage discharge ignition mode.
5. An auto-ignition method applied to a hot metal ladle scrap baking apparatus according to claim 2, wherein the feeding of gas to the ignition area through the gas supply mechanism and the compressed air mechanism comprises: The gas supply mechanism adjusts the opening of the valve according to preset gas flow parameters of 5m <3 >/min, and conveys the gas to the ignition area after stabilizing the pressure to 0.05MPa through the pressure reducing valve; the fuel gas and the compressed air are mixed in the ignition region to form a combustible mixture.
6. The method for automatically igniting the hot metal ladle scrap roasting device according to claim 1, wherein the method further comprises the steps of sequentially performing three-stage flame verification after ignition, wherein the three-stage flame verification comprises the steps of detecting an initial pilot flame through an ultraviolet flame sensor, detecting the gradient change rate of the temperature of a combustion chamber through a K-type thermocouple, identifying the flame form through an infrared vision system, and judging that the form is normal when the flame pixel ratio in a preset ROI area is more than 60 percent.
7. The automatic ignition method for a hot metal ladle scrap baking apparatus according to claim 6, wherein flame verification is performed sequentially, further comprising: When two or more stages of detection abnormality exist in three-stage verification, the gas supply and the power supply are turned off within less than or equal to 3 seconds, an audible and visual alarm is sent out, and meanwhile, fault codes are pushed to a remote control system.
8. An automatic ignition system applied to a hot metal ladle scrap baking device, comprising: The control unit takes the PLC as a core and integrates a PID temperature control module, a dynamic interval adjustment algorithm module and a safety interlocking logic module; The execution unit is used for igniting the high-temperature-resistant cable, connecting a power supply and the low-voltage hot bar, transmitting electric energy to the low-voltage hot bar arranged in the hot metal ladle scrap steel baking device and preheating; the low-voltage hot bar is arranged in the hot metal ladle scrap steel baking device and receives electric energy through the ignition high-temperature-resistant cable for preheating; The fuel gas supply mechanism is communicated with the ignition area and is used for conveying fuel gas to the ignition area when the low-pressure hot bar reaches a preset ignition condition; The compressed air mechanism is communicated with the ignition area and used for conveying compressed air to the ignition area when the low-pressure hot rod reaches a preset ignition condition; The dual-mode igniter integrates an ignition burner capable of generating high-pressure sparks and a high-pressure discharge device with dynamically adjustable electrode spacing, wherein the ignition burner generates high-pressure sparks to act on the surface of a preheated low-pressure hot rod to ignite combustible mixed gas after fuel gas and compressed air are mixed; the sensing and verifying unit comprises an ultraviolet flame sensor, a K-type thermocouple, an infrared vision camera and an air flowmeter, and is used for acquiring ignition process parameters and verifying flame; the safety unit comprises an emergency cut-off valve, an audible and visual alarm and a remote fault pushing module and is used for safety protection under abnormal working conditions.
9. The automatic ignition system for the hot metal ladle steel scrap roasting device, as claimed in claim 8, is characterized in that the gas supply mechanism comprises a gas manual valve, a gas pneumatic ball valve, a pressure reducing valve and a gas pressure stabilizing valve, wherein the gas manual valve is normally opened and is used for closing gas supply during maintenance, the gas pneumatic ball valve is provided with switch feedback and is used for controlling the on-off of a gas passage, and the pressure reducing valve is used for stabilizing the gas pressure to 0.05MPa.
10. The automatic ignition system for the hot metal ladle steel scrap roasting device, as claimed in claim 8, wherein the compressed air mechanism comprises a compressed air manual valve, a compressed air pneumatic ball valve and a pressure reducing valve, wherein the compressed air manual valve is normally opened and used for controlling the supply of compressed air, the compressed air pneumatic ball valve is used for controlling the on-off of a compressed air passage, the air flow is regulated to a set value after high-pressure spark is stabilized, and the pressure reducing valve is used for stabilizing the pressure of the compressed air to 0.6 MPa+/-0.05.

Description

Automatic ignition method and system applied to hot metal ladle scrap steel baking device Technical Field The invention belongs to the technical field of steel smelting, in particular relates to an automatic ignition method and an automatic ignition system applied to a hot metal ladle scrap steel baking device, and particularly relates to a high-efficiency, energy-saving and safe automatic ignition solution based on dual-mode ignition, intelligent control and dynamic parameter optimization. Background In the steel smelting process, scrap steel is added into a hot metal ladle to be baked in advance to improve the temperature, improve the iron-steel ratio and reduce the molten iron loading amount, so that the smelting cost is greatly reduced. The traditional scrap steel baking mode is mostly dependent on manual ignition, a normally open flame is ignited by an ignition rod through introducing a fire source, and after the normally open flame is ignited, coal gas can be introduced and heated, so that the efficiency is low, potential safety hazards exist in surrounding coal gas areas, the existing industry also has ignition modes such as gas jet type ignition, electronic ignition and the like, but the combustion is not ideal in a low-temperature and high-wind environment, the ignition is easy to extinguish, multiple ignition is needed, and the safety guarantee is poor. Meanwhile, after ignition, the fire is basically not easy to be turned off due to long open fire, and a large amount of energy gas (coal gas, oxygen and the like) is consumed in a non-baking period, so that obvious energy waste is caused. In the prior art, china patent CN108397784A published in 2018, 8 and 14 discloses a blast furnace gas ignition and diffusion system, an overhead ignition companion burner and a catalytic reaction chamber are adopted, automatic ignition and companion burning are realized through an elevator arc generating device, but ignition efficiency is low, ignition failure is easy to occur, in addition, china patent CN113774185A published in 2021, 12 and 10 discloses a scrap steel hopper baking device and method based on automatic ignition and gas explosion prevention, automatic flame monitoring and rapid fuel supply cutting are realized, continuous energy consumption problem caused by open flame cannot be effectively solved, and the whole baking energy efficiency is limited. The prior art does not adopt a composite ignition mechanism of low-pressure hot bar preheating and high-pressure spark ignition, does not realize an electrode spacing dynamic adjustment function based on air flow, and cannot solve the triple technical problems of low ignition success rate, high energy consumption of long open flame and poor working condition adaptability. Therefore, there is a need in the art for an automatic ignition method and system that can significantly improve the one-time ignition success rate, greatly shorten the ignition time, intelligently adapt to different working conditions, and thoroughly eliminate the non-working energy consumption of a long open flame. Disclosure of Invention The invention aims to provide an automatic ignition method and an automatic ignition system applied to a hot-metal ladle scrap steel baking device, aiming at the problems of low manual ignition efficiency, high safety risk, easy extinction, on-site repeated operation and the like of the hot-metal ladle scrap steel baking device. The automatic ignition method for the hot metal ladle steel scrap baking device is characterized by comprising the steps of starting a power supply of the hot metal ladle steel scrap baking device, preheating a low-pressure hot bar arranged in the hot metal ladle steel scrap baking device through an ignition high-temperature-resistant cable based on the power supply of the hot metal ladle steel scrap baking device, triggering a gas supply mechanism and a compressed air mechanism of the hot metal ladle steel scrap baking device to respectively convey gas and compressed air to an ignition area to form combustible mixed gas when the preheating of the low-pressure hot bar is completed and reaches preset ignition conditions, generating high-pressure sparks on the surface of the preheated low-pressure hot bar through an ignition burner, and igniting the combustible mixed gas through the composite energy of the hot surface and electric sparks to realize the automatic ignition of the hot metal ladle steel scrap baking device. The low-voltage hot bar preheating process comprises the steps of adjusting heating power through temperature regulation at the initial stage of ignition to enable the low-voltage hot bar to reach a reference temperature of 800 ℃ within a set time of 3 seconds, entering an ignition window period of 5-8 seconds after the low-voltage hot bar reaches the reference temperature and waiting for the preset time of 3 seconds, and triggering a gas supply mechanism and a compressed air mechanism to convey gas to an ignitio