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Boliden Harjavalta uses propane as reductant in copper anode furnaceCopper Anode furnace. Propane is fed via specific gas feeding pipes to furnaceFurnace. In the summer of 2022, the wear of propane gas feed pipes in the Boliden Harjavalta copper anode furnaceCopper Anode furnace increased significantly, with a peak of 84 replacementsReplacement in July, compared to the usual 5–20. This paper presents a summary of failure analysisFailure analysis, actions taken, and currentCurrent situation. AnalysisAnalysis revealed that chlorideChloride-induced corrosionCorrosion and poor welding quality in gas feed pipe were primary causes of pipe failures. Installation practices also may have contributed to the issue, exposing structural steel to moltenMolten copperCopper. To address this, operating instructions were reviewed, and trials with different materials were conducted. Eventually, thicker single-material pipes were used, reducingReducing the need for replacementsReplacement to 3–9 per month by early 2024.

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Failure Analysis and Corrective Actions for Propane Gas Feed Pipes in Copper Anode Furnaces

  • 会议论文

  • 发表日期：

    2025年

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  • Jaakko Korpela,
  • Esa Peuraniemi,
  • Juha Järvi,
  • Petri Latostenmaa

摘要

Boliden Harjavalta uses propane as reductant in copper anode furnaceCopper Anode furnace. Propane is fed via specific gas feeding pipes to furnaceFurnace. In the summer of 2022, the wear of propane gas feed pipes in the Boliden Harjavalta copper anode furnaceCopper Anode furnace increased significantly, with a peak of 84 replacementsReplacement in July, compared to the usual 5–20. This paper presents a summary of failure analysisFailure analysis, actions taken, and currentCurrent situation. AnalysisAnalysis revealed that chlorideChloride-induced corrosionCorrosion and poor welding quality in gas feed pipe were primary causes of pipe failures. Installation practices also may have contributed to the issue, exposing structural steel to moltenMolten copperCopper. To address this, operating instructions were reviewed, and trials with different materials were conducted. Eventually, thicker single-material pipes were used, reducingReducing the need for replacementsReplacement to 3–9 per month by early 2024.