Additive Manufacturing of Centrifugal Impellers for Solid Oxide Fuel Cell Anode Offgas Recycle Blowers

Abstract A form of laser powder bed fusion (LPBF) 3D printing has been used to manufacture the impellers of anode offgas recycle blowers (AORBs) for solid oxide fuel cell (SOFC) applications. The material selected is Inconel 718, since it can endure the conditions and temperature ranges in which these systems typically operate. This paper presents details of the multiple process trials and the issues resolved to achieve a successful build, demonstrating the feasibility of the method for impeller manufacturing. Also discussed are the potential cost and design flexibility benefits that may be derived from 3D printing methods, particularly during integration of prototype and low count turbomachinery production runs. The paper discusses long-term goals of the project to support the reduction of cost of SOFC power plants by reducing the cost of balance of plant (BOP) subsystems, from design to integration.