Dehydrogenation of ammonia for electricity production: Effect of recirculation fraction Firman Bagja Juangsa a), Prihadi Setyo Darmanto a), Muhammad Aziz b)
a) Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung
Jl. Ganesha 10, Bandung, 40132 Indonesia
b) Institute of Industrial Science, The University of Tokyo
4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
Abstract
Hydrogen (H2) has been widely studied as a promising energy carrier. However, the storage and transportation of H2 are challenging yet critical technology for H2 energy system implementation. This work proposes an integrated system of energy utilization of NH3, which has been known as one of the promising methods of H2 storage. The integrated system consists of NH3 decomposition by the thermo-catalytic process and power generation process from H2. The heat generated from oxy-fuel combustion of H2 is utilized to supply the thermal energy required for the endothermic process of NH3 decomposition, and the remaining heat is converted to electricity by a combined cycle. A portion of exhaust gas is recirculated to the combustion chamber and the heat circulation of the system is designed and optimized based on enhanced process integration (EPI), resulting in a highly efficient system. The result shows an optimum configuration of the integrated system with a recirculation fraction of 0.5-0.55, which is resulting in high system efficiency of 51.4%. The proposed work demonstrated an integrated system of H2-based energy utilization of NH3 with CO2-free, while maintaining a highly efficient system.
Keywords: ammonia decomposition, CO2-free, hydrogen, energy efficiency, power generation
