Design and performance assessment of a novel ammonia-fueled integrated CHP-Based multigeneration system regarding to various EGR ratios: An energy approach

Recently, there has been a growing focus on the implementation of integrated energy systems using low-carbon fuels to align with sustainability objectives. This study conducted an investigation into a novel CHP system, which was designed to meet the efficient energy production. This innovative system utilized the ammonia fuel within Brayton cycle, incorporating various interconnected subsystems, including the Kalina cycle, High-Temperature Steam Electrolysis, ultra supercritical steam Rankine cycle as well as ammonia synthesis reactor. The primary aim of this system was to reduce dependence on external resources by establishing local sources for water and fuel, thus enhancing energy sustainability. Using Gaseq and EES software, thermochemistry and thermodynamic models of the integrated system was developed, providing valuable insights into the interactions among system parameters. In-depth investigations involved the examination of different energy system scenarios. The results revealed the superiority of the integrated system with a remarkable thermal efficiency of 47.8% and a net power generation of 2.65 MW, in contrast to the ammonia Brayton cycle with power generation of 1.43 MW and an efficiency of 28.7%. This study also highlighted the environmental benefits of the ammonia Brayton system by zero carbon and under 10 ppm NOx emission, showcasing its significant environmental sustainability.