Publikations Einzelansicht

Titel: Tailor-made materials for high temperature applications: New strategies for radiant coil material development
 

Autor(en):
 
D. Jakobi, C. van de Moesdijk, P. Karduck und A. von Richthofen
 
Journal: NACE Corrosion 2009
Jahr: 2009
Band: Paper No. 09155


Zusammenfassung:
A new and unique bench-scale unit is presented to simulate high temperature corrosion of alloys for radiant coils in Petrochemical Plants. This unit is developed and dedicated for the examination of samples at steam cracking conditions: e.g. high metal temperatures/lower gas temperatures, low residence times and a gas mixture which corresponds to the composition within the outlet tube of a radiant coil. The oxide layers formed during the start-up of a cracking furnace are examined for different temperature profiles. Different surface conditions of the inner tube surface as well as the catalytic coke formation on oxidized surfaces are investigated. This provides valuable information on the amount and location of catalytically active sites formed on the oxide layer. Furthermore, in order to evaluate the oxide layer stability of different alloys after several runs, samples are exposed to controlled coking and decoking cycles under various conditions. The new test rig also allows the introduction of feed contaminants or reactive elements into the process gas for testing their specific influence on materials deterioration. All these features enable tailor - making tube materials specific to the coil design and the operating conditions, in order to optimize the benefits of precise material selection.<br> Exemplary test results of conventional and experimental alloys are presented.

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Publikations Einzelansicht

Titel: Tailor-made materials for high temperature applications: New strategies for radiant coil material development
 

Autor(en):
 
D. Jakobi, C. van de Moesdijk, P. Karduck und A. von Richthofen
 
Journal: NACE Corrosion 2009
Jahr: 2009
Band: Paper No. 09155


Zusammenfassung:
A new and unique bench-scale unit is presented to simulate high temperature corrosion of alloys for radiant coils in Petrochemical Plants. This unit is developed and dedicated for the examination of samples at steam cracking conditions: e.g. high metal temperatures/lower gas temperatures, low residence times and a gas mixture which corresponds to the composition within the outlet tube of a radiant coil. The oxide layers formed during the start-up of a cracking furnace are examined for different temperature profiles. Different surface conditions of the inner tube surface as well as the catalytic coke formation on oxidized surfaces are investigated. This provides valuable information on the amount and location of catalytically active sites formed on the oxide layer. Furthermore, in order to evaluate the oxide layer stability of different alloys after several runs, samples are exposed to controlled coking and decoking cycles under various conditions. The new test rig also allows the introduction of feed contaminants or reactive elements into the process gas for testing their specific influence on materials deterioration. All these features enable tailor - making tube materials specific to the coil design and the operating conditions, in order to optimize the benefits of precise material selection.<br> Exemplary test results of conventional and experimental alloys are presented.

Zurück zur Listen Ansicht