Enhancing thermal and exergy performances in a CO2-Free micro-combustor with reverse flow double-channel outlet structure

The present study proposes a reverse flow single-channel inlet and double-channel outlet (SIDO) microcombustor for the analysis of the thermal performance and nitrogen oxide emission characteristics of ammonia/hydrogen-fuelled energy conversion system. Comparison is then made between the proposed system and the conventional single-inlet and single-outlet system. The present findings show that the SIDO combustor is associated with enhanced thermal performances. Increasing the inlet pressure Pin improves thermal performance and the exergy efficiency while reducing nitrogen oxide emissions. Increasing the inlet flow velocity Vin can enhance the temperature uniformity of the combustor wall. It is also found that the ammonia combustion convection heat transfer performance is optimized, when Vin = 1.25 m/s. Increasing the equivalence ratio & phi; leads to a reduction of nitrogen oxide emissions, and the micro-combustor has a better overall performance, when & phi; = 1.0. Finally, Increasing the blending ratio of hydrogen with ammonia & phi;b gives rise to a decayed advection but enhanced diffusion, and the total pressure loss (Ploss) can be reduced. This present study confirms the viability of employing the SIDO reverse flow structure to enhance thermodynamic performances from microcombustion energy conversion systems.

Automated summary

This study proposes a reverse flow single-channel inlet and double-channel outlet (SIDO) microcombustor for analyzing the thermal performance and nitrogen oxide emission characteristics of ammonia/hydrogen-fuelled energy conversion systems. The findings show that the SIDO combustor has improved thermal performance and reduced nitrogen oxide emissions. Increasing the inlet pressure improves exergy efficiency and reducing nitrogen oxide emissions. Increasing the inlet flow velocity enhances the temperature uniformity of the combustor wall. This study confirms the viability of using the SIDO reverse flow structure to enhance thermodynamic performances in microcombustion energy conversion systems.