Characterising premixed ammonia and hydrogen combustion for a novel Linear Joule Engine Generator

• DOI: 10.1016/j.ijhydene.2021.04.110
• Publication Date: 2021-05-15T11:30:43Z
• Authors: Fangyu Zhang; Gen Chen; Dawei Wu; Tie Li; Zhifei Zhang; Ning Wang
• Keywords: 13. Climate action; 0202 electrical engineering, electronic engineering, information engineering; 02 engineering and technology; 7. Clean energy

Abstract A novel ammonia/hydrogen dual-fuelled Linear Joule Engine Generator (LJEG) is developed for medium to large scale power generations and electrification of ship propulsion systems. The characteristics of premixed ammonia/hydrogen combustion of the LJEG are investigated through chemical kinetic modelling. Three representative mechanisms are compared based on their accuracy of reproducing experimental results. With robust combustion and low N O x emission as the primary targets, laminar burning velocity, ignition delay and flame species concentration are investigated over a wide range of equivalence ratio ( 0.8 − 1.6 ) , hydrogen blending ratio ( 0.0 − 0.6 ) , oxygen content ( 0.21 − 1.00 ) , inlet temperature ( 300 K − 700 K ) and pressure ( 1 b a r − 20 b a r ) . Rate of production (ROP) analysis is carried out to gain in-depth understanding of critical N O production and consumption pathways. The results indicate that an equivalence ratio around 1.1 is beneficial for both combustion robustness and N O x emission reduction. Both adding hydrogen in the fuel ( 40 % V o l ) and enriching oxygen in the oxidizer ( 60 % V o l ) promote burning velocity to the similar level of methane ( 37 c m / s ) . Explicit reduction of N O emission is observed when pressure increases, which can be attributed to the combination of N H i radicals. The findings show the potential of the ammonia and hydrogen fuelled LJEG for ultra-low emission power generation.