Ammonia can be used as an alternative to fossil fuels in gas turbines and gas boilers

thereby showing good application prospects for supporting the move towards low carbon emissions. Tubular combustion

as a new combustion technology

has significant advantages in stabilizing combustion and reducing pollutant emissions. In this paper

experimental studies of ammonia-methane miscible combustion are carried out on a self-constructed cyclone tubular flame combustor

focusing on the effects of the volume ratio of methane to fuel

equivalence ratio

and fuel/air injection modes on the combustion and pollutant formation characteristics of the ammonia-methane tubular flame. The studies show that ammonia-methane combustion can effectively improve the combustion stability and significantly extend the stable combustion range of the tubular flame. The doped combustion mode with centralized ammonia supply (a central ammonia jet surrounded by tangential methane jets) can effectively reduce nitrogen oxides production

and the staged combustion with axial overfired air supply can further reduce the exhaust pollutant emissions by more than 50%. This study can provide experimental reference for reducing NOx generation during ammonia tubular flame combustion.