Menu
Search
Filters
Close
Menu

51317--9784-High Temperature Coking Resistance of an Alumina Forming Alloy

Picture for High Temperature Coking Resistance of an Alumina Forming Alloy
Available for download

Coking is carbon deposition from a gas phase that is encountered in many reforming, cracking and other high temperature processes. An experimental high temperature coking atmosphere was constructed and used to evaluate the effects of temperature, time and metal surface roughness on the carbon deposition of an alumina forming alloy.

 

Product Number: 51317--9784-SG
ISBN: 9784 2017 CP
Author: Benjamin Church
Publication Date: 2017
Industry: Petroleum Refining
$0.00
$20.00
$20.00

Coking is the process of carbon deposition from a gas phase that is encountered in many reforming cracking and other high temperature processes. Coking in certain petrochemical processes can lead to carbon build up causing reduced process efficiency corrosive attack and degradation of the alloy. Components used in these processes are fabricated from HP alloys that form a chromia-based oxide layer or more recent alloys that form an alumina-based oxide layer to help protect against coking.An experimental high temperature coking atmosphere was constructed and used to evaluate the effects of temperature time and metal surface roughness on the carbon deposition of an alumina forming alloy. Coking conditions were simulated with multiple atmospheres including CO-H2 mixtures at moderate temperatures (e.g. 650 °C) and ethane at higher temperatures (e.g. 900 °C). Carbon deposition was tracked using specific mass change of the samples as a function of exposure times and conditions. Results obtained with the alumina forming alloy were compared to a baseline HP alloy. The materials were analyzed using XRD SEM and optical microscopy to characterize the oxide layer formation carbon deposition layers and carbon attack and changes to base metal microstructure. Raman spectroscopy was used to characterize the carbon deposits. The overall resistance of the alumina-forming alloys relative to the traditional chromia forming composition will be described.

Key words: High temperature corrosion, carbon deposition, cyclic conditions, alumina forming alloy, chromia forming alloy.

Coking is the process of carbon deposition from a gas phase that is encountered in many reforming cracking and other high temperature processes. Coking in certain petrochemical processes can lead to carbon build up causing reduced process efficiency corrosive attack and degradation of the alloy. Components used in these processes are fabricated from HP alloys that form a chromia-based oxide layer or more recent alloys that form an alumina-based oxide layer to help protect against coking.An experimental high temperature coking atmosphere was constructed and used to evaluate the effects of temperature time and metal surface roughness on the carbon deposition of an alumina forming alloy. Coking conditions were simulated with multiple atmospheres including CO-H2 mixtures at moderate temperatures (e.g. 650 °C) and ethane at higher temperatures (e.g. 900 °C). Carbon deposition was tracked using specific mass change of the samples as a function of exposure times and conditions. Results obtained with the alumina forming alloy were compared to a baseline HP alloy. The materials were analyzed using XRD SEM and optical microscopy to characterize the oxide layer formation carbon deposition layers and carbon attack and changes to base metal microstructure. Raman spectroscopy was used to characterize the carbon deposits. The overall resistance of the alumina-forming alloys relative to the traditional chromia forming composition will be described.

Key words: High temperature corrosion, carbon deposition, cyclic conditions, alumina forming alloy, chromia forming alloy.

Product tags
Also Purchased
Picture for Oxidation Kinetics of Cast Alumina-Forming Austenitic Alloys in Steam
Available for download

51317--9785-Oxidation Kinetics of Cast Alumina-Forming Austenitic Alloys in Steam

Product Number: 51317--9785-SG
ISBN: 9785 2017 CP
Author: Benjamin Church
Publication Date: 2017
$20.00

Alloy tubes used in petrochemical processing reactor systems are often subjected to oxidizing conditions in high temperature steam such as during de-coking cycles. A new class of heat resistant austenitic cast alloys are being developed that are designed to form protective oxides of alumina.
Picture for High Temperature Alloys Failures in the Petrochemical Furnaces. Mitigation and Prevention
Available for download

51318-10877-High Temperature Alloys Failures in the Petrochemical Furnaces. Mitigation and Prevention

Product Number: 51318-10877-SG
Author: Ali H. AlShawaf / Manabendra K. Maity
Publication Date: 2018
$20.00

This paper explains the most common damage mechanisms of high temperature alloys in radiant section such as creep/carburization, thermal fatigue/carburization, and thermal shock.

 
Picture for Accelerated Corrosion of 304H SS in RFCC Regenerators Involving Low Temperature Eutectic-Forming Sal
Available for download

Accelerated Corrosion of 304H SS in RFCC Regenerators Involving Low Temperature Eutectic-Forming Salts

Product Number: 51317--8915-SG
ISBN: 8915 2017 CP
Author: Jayant Nair
Publication Date: 2017
$20.00

This article presents findings on type II high temperature (650-800ºC) corrosion in Residue Fluid Catalytic cracking (RFCC) regenerator service (alloy SS304H) and examines the possible strategies for alloy upgrade in RFCC service.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support