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09155 Tailor-Made Materials for High Temperature Applications: New Strategies for Radiant Coil Material Development

Picture for 09155 Tailor-Made Materials for High Temperature Applications: New Strategies for Radiant Coil
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Product Number: 51300-09155-SG
ISBN: 09155 2009 CP
Author: Dietlinde Jakobi, Alexander von Richthofen, Peter Karduck and Cor van de Moesdijk
Publication Date: 2009
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$20.00
$20.00
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. Exemplary test results of conventional and experimental alloys are presented.

Keywords: Alumina, carburization, centrifugally cast alloy, chromia, coking, corrosion, high temperature alloy, hydrocarbon, ethylene pyrolysis, oxidation, oxide scale
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. Exemplary test results of conventional and experimental alloys are presented.

Keywords: Alumina, carburization, centrifugally cast alloy, chromia, coking, corrosion, high temperature alloy, hydrocarbon, ethylene pyrolysis, oxidation, oxide scale
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