AISTech 2022

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Campaign Life Extension of Blast Furnace Offgas System (Room 404)

During the 33 years of operation, an operator's blast furnace offgas system experienced high metal loss, significant dust buildup due to process issues, and buckling damages due to high-temperature events. This paper presents the fitness-for-service assessment that developed strategies for: short-term local repairs without production interruptions and long-term repairs for campaign life extension until next planned major maintenance shutdown. These strategies include external reinforcements, refractory lining, operational controls and a health monitoring plan. The plant successfully performed the repairs and was able to continue the operation without production interruptions, resulting in major financial benefits and improved safety conditions.