Methodology for Attrition Evaluation of Oxygen Carriers in Chemical Looping Systems

This Small Business Innovation Research (STTR) project targets the development of novel methodology for the evaluation of a wide range of oxygen carriers, in particular, their attrition resistance, under conditions that broadly account for the process requirements of coal-based chemical looping systems. Existing test protocols and procedures for the evaluation of granular materials do not accurately reflect the unique process conditions of chemical looping systems, including high temperatures and cyclic operation between oxidizing and reducing atmospheres. The basis for the proposed work is the ASTM D5757 air-jet standard for attrition testing. Several modifications to the existing standard are proposed that will provide complete characterization of the attrition tendency of the oxygen carrier and allow the manufacturer to focus on specific aspects of its design, or to quickly and accurately compare multiple material types. Phase I will include the development of the equipment and methodologies for testing. Consultation from prominent chemical looping technology developers will be acquired to provide guidance in determining the current needs of the market and where existing protocols are lacking. In addition, one oxygen carrier will be selected for evaluation. Phase II will include the implementation of equipment improvements that will provide a completely automated system that can be operated for multiple continuous cycles with minimal operator supervision. In addition, an extensive test campaign will be accomplished that will cover a wide range of oxygen carrier types and process conditions. Commercial Application and Other Benefits: Commercial application involves the development of an objective material testing service, without conflict of interest and independent from chemical looping technology developers and material suppliers. The service will facilitate the development of chemical looping technology which is a potentially attractive approach for carbon dioxide capture and emissions mitigation.