This research project targets the development of a technology for segregating fuel-based contaminants (char and ash) from oxygen carrier material in the context of chemical looping combustion application. In chemical looping, the well-mixed solids that flow from the fuel reactor consisting of char, ash, and oxygen carrier particles cannot be completely separated into their constituents before they enter the air reactor. The slip of carbon leads to char oxidation in the wrong reactor and poor carbon dioxide separation efficiency. The buildup of ash that is not rejected necessitates rejection of larger quantities of oxygen carrier material, resulting in a high operating cost penalty. An efficient method to separate char and ash from oxygen carrier material is critical for the deployment of chemical looping technology. This project will develop a novel method for char/ash separation from oxygen carriers that is specifically tailored to chemical looping combustion and its unique constraints and process conditions. The segregation system consists of a novel combination of methodologies that together will provide very high segregation efficiency, even under the extreme conditions of chemical looping systems.
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