Concepts of ammonia/hydrogen engines for marine application

The “CAHEMA” project aims at increasing fundamental and practical knowledge in ammonia/hydrogen engines for marine application. On the one hand, developments of chemical kinetic mechanism (NTNU) and CFD modelling tools (Lund) will provide a strong base for analysis of ammonia/hydrogen combustion. On the other hand, engine experiments (Aalto) will be carried out, in research laboratories, to verify two different novel engine concepts firing with ammonia/hydrogen fuels. Furthermore, the project will assess economical, regulatory and environmental aspects of ammonia/hydrogen marine engines. The two novel combustion concepts under investigation are referred to as reactivity-controlled compression ignition, RCCI); (b) direct-injection dual fuel stratification (referred to as DDFS). NTNU will be the principal investigator (PI) of WP1, in which detailed chemical kinetic mechanisms for ammonia (NH3), hydrogen (H2) and n-heptane (C7H16) mixture will be developed. At DTU there is a well-established laminar flow reactor (LFR) experimental rig that will be used to measure the species profiles under pressure upto 100 atm, or at atmospheric pressure but high temperatures. These data will be used to validate the chemical kinetic model. In subtask 2 of WP2, LU will apply the CFD model and NTNU will use the stochastic reactor model (SRM) to study two different engine concepts (RCCI and DDFS). WP3 will have AU as the PI will use research engines to evaluate the two combustion concepts RCCI and DDFS. WP4 with WMU as PI, will assess the environmental and socio-economic impacts of the two engine concepts for NH3/H2 marine engines.