Predicting the Oxidation/Corrosion Performance of Structural Alloys in Supercritical CO2

 

Inconel 625: 3,500 hours impure sCO<sub>2</sub> exposure.
Inconel 625: 3,500 hours impure sCO2 exposure.
Performer: 
Electric Power Research Institute, Inc.
Website:  Electric Power Research Institute Inc.
Award Number:  FE0024120
Project Duration:  10/01/2014 – 09/30/2017
Total Award Value:  $571,185
DOE Share:  $408,948
Performer Share:  $162,237
Technology Area:  Coal Utilization Science
Key Technology:  High Performance Materials
Location:  Charlotte, North Carolina

Project Description

The goal of this project is to develop an oxidation/corrosion model to predict the performance of structural alloys in terms of oxide growth rate and tendency for scale exfoliation, in supercritical CO2 in severe operating environments at high temperatures. This goal will be accomplished by: 1) short-term isothermal lab scale oxidation/corrosion tests in high-pressure (200 atmosphere [atm] or higher) and high-temperature (650-750 degrees Celsius) supercritical CO2; 2) characterization of the oxide scales on the exposed samples, determination of the oxide scale growth and exfoliation kinetics and 3) modeling of the process of oxide growth and exfoliation with and without heat-flux, and application of the model to actual tube geometries. A longer-term exposure on a relevant geometry will also be conducted as a confirmatory test for the developed model. Using the model results, recommendations will be made for structural materials selection for alloys in high temperature supercritical CO2 environments. A validated model to predict oxidation and exfoliation rates of structural alloys in advanced supercritical CO2 (sCO2) power generation cycles will be developed.

Project Benefits

The model developed will be a useful tool for power plant designers to select structural materials for various components in a supercritical CO2 system, and for researchers to guide new alloy development work for supercritical CO2 cycles. It will also ensure that materials can achieve the desired conditions for high efficiency, and provide key data needed by heat-exchanger manufacturers. May lead to stream-lined testing and/or improved criteria for materials selection based on oxidation/corrosion.

Contact Information

Federal Project Manager 
Vito Cedro: vito.cedro@netl.doe.gov
Technology Manager 
Briggs White: briggs.white@netl.doe.gov
Principal Investigator 
John Shingledecker: jshingledecker@epri.com
 

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