Oxygen Lance Leakage Accident
Causes of the Accident
Damage to the Oxygen Lance Nozzle: During the blowing process, the oxygen lance nozzle is subject to the scouring and erosion of high - temperature molten steel and slag, as well as frequent temperature changes, and is prone to damage such as cracks and wear. Once the nozzle is damaged, it may lead to cooling water leakage.
Failure of the Oxygen Lance Cooling System: Problems in the cooling system such as blockage of cooling water pipelines, insufficient water pressure, or poor sealing may also lead to oxygen lance leakage.
Countermeasures
Strengthening Inspection and Maintenance of the Oxygen Lance: Before and after each use, carefully inspect the oxygen lance, including the appearance of the nozzle and the cooling water channels. Replace damaged nozzles in a timely manner to ensure the normal operation of the oxygen lance.
Improving the Monitoring of the Cooling System: Install pressure sensors, flow sensors, and other equipment to monitor the water pressure and water flow of the cooling system in real - time. Once an abnormality is detected, take measures in a timely manner, such as stopping blowing and replacing the oxygen lance.

 

 

 

Over - oxidation of Molten Steel Accident
Causes of the Accident
Excessive Blowing - Oxygen Volume: During the converter steel - making process, if the blowing - oxygen volume exceeds the amount required for the oxidation of elements such as carbon in molten steel, it will lead to over - oxidation of the molten steel. This may be due to the operator's misjudgment of the end - point of blowing or the unreasonable setting of the blowing process parameters.
Improper Control of the End - Point Carbon: Carbon is one of the key elements affecting steel quality. At the end - point of blowing, if the carbon content in molten steel cannot be accurately controlled, over - oxidation of the molten steel is likely to occur.
Countermeasures
Precise Control of the End - Point of Blowing: Adopt advanced end - point control technologies, such as sub - lance detection and furnace gas analysis methods, to accurately determine the end - point of blowing. According to the requirements of the steel grade, reasonably control the carbon content and temperature of molten steel to avoid over - oxidation.
Optimization of the Blowing Process: Through experiments and practical experience, continuously optimize the blowing process parameters to ensure the rational use of oxygen and prevent excessive blowing - oxygen volume.

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