MICRO TURBO-FUEL-CELL-TECHNOLOGY: Hybrid compact turbo machinery technology and thermodynamic aspects regarding design parameters of a high efficient MGT-SOFC-system

Heinz Peter Berg; Roland Dückershoff; Mario Lehmann; Nontavut Prechavut

doi:10.29008/ETC2017-266

12^th European Conference on Turbomachinery Fluid dynamics & Thermodynamics

Paper ID:

ETC2017-266

Main Topic:

Optimization

https://doi.org/10.29008/ETC2017-266

Authors

Heinz Peter Berg - BTU Brandenburg, University of Technology
Roland Dückershoff - THM, University of Applied Sciences
Mario Lehmann - BTU Brandenburg, University of Technology
Nontavut Prechavut - BTU Brandenburg, University of Technology

Abstract

The improvement of decentralised energy supply systems has received an important role in the recent years. One option is the combination of SOFC with recuperated MGT. Here, a new strategy for selecting the system parameters, such as the operating temperature of the SOFC, turbine inlet temperature and the pressure ratio of the hybrid system, is presented. By introducing the heat ratio between the heat required to increase the process gas to the SOFC operating temperature and the heat required to raise the SOCF exhaust gas to the TIT, it was found that high efficiency (approx. 68%) is realisable in a compact hybrid system today. Analysis also shows that the HEX-technology is needed to improve the system effectiveness. Also, high recirculation rates with lower TIT can be considered as the future development direction. In addition, a sample configuration of an oil-free MGT rotor unit with high speed foil bearings is presented.